Tubes, the file-sharing tool we covered in January, pushed out a new update last night that adds support for Windows Vista and "300 [other] enhancements." Maybe one of the best new features is an auto-updater that will download and install new builds of the app without requiring user re-installation. After all, if you're going to install something on your machine, you should really only have to do it once (an idea iTunes could learn from.)
Adesso also announced that more than half a million people have downloaded the app since launch (PDF). There's still no Mac support though, which is a real bummer.