digg_url = 'http://digg.com/gadgets/The_Top_12_iPhone_Application_Resource_Sites';

1. Apple - Web apps

2. appSafari.com

3. iPhoneAppr

4. Planet iPhones

5. appRater.com

6. ZDNET - iPhone apps

7. iphoneapplicationlist.com

8. iphoneapps.co.uk

9. Download.com - iPhone apps

10. modmyifone.com - iPhone Applications List

11. Best iphone Apps

12. IPhone Apps | Cool OSX Apps

Further Reading
13. Lifehacker Top 10: Top 10 iPhone applications.
14. Top 25 Web Apps for iPhone - Rev2.org
15. The 25 [...]