You set this up by long-clicking on your home screen and choosing ''Widgets''.
If you''re having trouble, visit the website or email the support address!
-Choose from a few icon sets
-Add or re-add widget to configure or re-configure the icon
-Included a link to the Market to download an app launcher shortcut so you can bind this to hardware buttons.
Only tested on a 2.2.x, 2.3.x Nexus One, though works on some others.
Based on the comments posted, it should work on the following phones:
Nexus One 2.2.x, 2.3.x
N1 - Cyanogenmod 6 & 7
T-Mobile G2 (HTC Desire Z)
T-Mobile myTouch 4G (HTC Glacier)
HTC EVO (not sure which one!)
HTC Droid Incredible
HTC HD2 (Leo)
Samsung Galaxy S2 i9100