But anyway why would you do a thing like that?? ;o)

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The below method is not yet tested with iOS 4.0, if you try it, please post a comment if it works.

Most iPhone OS 2.0 / iPhone 3G users have experienced the very slow backup process each time the iPhone is connected to iTunes, and as more applications are installed the process will take even longer. It is possible to just cancel the backup process, and then make a regular Sync without backing up. However, if you want avoid the backup process from starting, there is a workaround. It is possible disable the automatic backup process from starting, and how to do this is described below; firstly for Mac users, and secondly for Windows users:

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Mac users:

1. Quit iTunes.
2. Open a Terminal (Applications > Utilities > Terminal)
3. Type or copy the following command:
   defaults write com.apple.iTunes AutomaticDeviceBackupsDisabled -bool true
4. Open iTunes.
5. Connect the iPhone.
6. Make Sync without backing up.

To enable automatic backup in iTunes again use this command instead:

Note: If you previously have used the command line option that entirely disables the backup feature, then type this command as well to enable to backup process:

Recommendation: If you choose to disable the automatic backup process, it would be a good idea to manually making a backup it once a while to get a safe copy of text messages, call log and like (just right-click your iPhone icon in iTunes).

Windows Users: (updated)

Windows users can use the same approach:

1. Quit iTunes.
2. Press Win+R (opens the Windows Run dialog)
3. Type or copy the following command:
   “%CommonProgramFiles%\Apple\Mobile Device Support\bin\defaults.exe” write com.apple.iTunes AutomaticDeviceBackupsDisabled -bool true
4. Open iTunes.
5. Connect the iPhone.
6. Make Sync without backing up.

Related posts:

1. Apple iTunes DJ – Queue Songs
2. Boot Camp: Windows 7 on iMac – Fix Black Screen
3. iPhone 3G: iPhone 2.0.1 Software Update available

Update – After some years the list was kind of outdated, here are some additional applications that I have recently used the most:

This is yet another list of favorite iPhone 3G applications available from the Apple App Store. Actually, it is not ordered top 10 list, but just a list of the 10 applications that I found most useful. No games are included since games qualify for their own top 10 list. Listed is also mainly free applications since I have only bought a couple of applications at this time. The list will be updated as new and better applications arrive at App Store.

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• Remote
  With Remote, you can control the music on your computer or Apple TV from your iPod touch or iPhone. Play, pause, skip, shuffle. See your songs, playlists, and album art on your iPod touch or iPhone as if you were right in front of your computer. Remote is free and works with your Wi-Fi network, so you can control playback from anywhere in and around your home.
• FileMagnet (NOT FREE 30DDK)
  FileMagnet makes it easy to copy files from your Mac and view them on your iPhone and iPod touch. It supports all the common file types, including PDFs, Microsoft Office documents, images, movies, sounds and even folders. By running the FileMagnet Uploader on your Mac, you can wirelessly copy files over your wi-fi network. FileMagnet also lets you copy files from your phone to another mac – use your iPhone like a hard drive!
  Constraints: It only works with Mac, one more thing that Windows users must  miss.
• Benzin Priser (A danish specific app)
  The application uses the FDM Benzin Priser service to get the latest gas-prices for your current area (GPS Support), or the latest prices for your regular gas stations. Reporting prices from the application to help others get gas cheaper is easy.
  Constraints: How usable this application is in your area rely on the frequency of gas prices reported.
• Facebook
  Facebook for iPhone makes it easy to stay connected and share information with friends. Use your iPhone to start conversations with Facebook Chat, check your friends’ latest photos and status updates, look up a phone number, or upload your own mobile phothos to Facebook whole on the go.
• Palringo Instant Messenger
  Palringo works by integrating with several existing, popular messaging services including Apple’s own iChat for Mac OS X. The other seven are AOL’s AIM, Google Talk, Yahoo! Messenger, Gadu Gadu, ICQ, Jabber and Windows Live Messenger.
• WordPress
  Introducing the first Open Source app that lets you write posts, upload photos, and edit your WordPress blog from your iPhone or iPod Touch. With support for both WordPress.com and self-hosted WordPress (2.5.1 or higher), users of all experience levels can get going in seconds.
• EverNote
  Evernote for iPhone (and iPod Touch) lets you capture any moment or idea as it happens, wherever you may find yourself. And, thanks to Evernote’s amazing cloud-based sync, you can recall it all any time from your iPhone, Mac, PC, the Web, or other mobile device.
• Shazam
  When you hear a song and wonder what it is, Shazam is there with the answer. Hold your iPhone to the music and within seconds we’ll tell you the artist and track name.
• Phanfare
  The phanfare iPhone application turns your iPhone into a connected digital camera. Once installed, you take photos with the Phanfare application and they are uploaded directly into your Phanfare account over the cell network and wi-fi.
• YouNote
  YouNote is an application for iPhone that allows you to take quick notes on all sorts of information. This information is accessible and available at all times on your iPhone. Whatever format the note is in (Drawing, Audio, Text, Photo, etc.), it is possible to link different criteria (tags, a color, the geolocation, etc.) which simplifies the filing and finding of the notes.

Related posts:

1. iPhone 3G: iPhone 2.0.1 Software Update available
2. Update iPhone without backing up (Mac and Windows)