Howto Quick Launch apps with your G1 and keyboard open

On any screen:

[SEARCH] button and the following letters will quickly jump from one app to another:

L - Calender
P - Music Player
I - Instant Messengers
E - E-Mail
G - G-Mail
Y - YouTube
S - SMS/MMS
M - Maps
B - Browser

These are the defaults, and can be changed by going to [MENU] -> Settings -> Applications -> Quick Launch