BTW one feature that's so small but makes a huge difference in 1.5.1 -- they added spacebar scrolling down in an email! That was the most frustrating thing about 1.1.0, it made scrolling through large stuff a real pain.

The Del key still doesn't delete an email yet and there's no way to label an email/conversation before Archiving it, though. *sigh* The new Contacts feature is pretty neat but lags a bit, kinda unusable.