Update: I've updated to WM6, and it works much better. Slightly faster interface, and it seems more stable. The biggest additions for me are solitaire and Voice Command.

The one drawback... my Samsumg WEP200 BT headset doesn't work with this Voice Command anymore (it did with the crappy WM5 version). I'm going to have to find out if there's a fix... but what good is voice recognition if I can't use it with my handsfree device?