The best case really depends on your intended use, and what sort of coverage you'd like. I'm a fairly careful person, I've owned my 3G for over 2 years without requiring a case, but with the iPhone 4 … more
You can download and use tweetie for free for as long as you want in an ad-supported version (much like twitteriffic), which is more than fair since the paid version will run you about $20. … more