There are two software updates that came out recently.
1. Mozilla Thunderbird version 3. I’ve used the Thunderbird Betas and RCs ever since they’ve been available and have, for the most part, been quite pleased. It’s been so long since I’ve used Thunderbird 2, that I don’t really remember how it looked. Thunderbird 3′s new tabs and search functionality are hard to live without now.
2. Adobe Air 2 beta. I haven’t used that many Air apps – mainly as there aren’t many out there. But, I have used a few. I think Jonathon Snook’s Snitter was an Air app. I used that for a while until he ceased development of it. I also have used ExtJS’s Documentation Air app a few times. The big updates are better profiling for CPU and memory and a Webkit update giving it the latest HTML5 and CSS3 features.