Recommend good notes/calendar plugin/client/suites ?

[Michael Yang <michael.yxf@gmail.com>]

Hi All:

I'm on the lenny/sid, with xfce4 desktop.
I'd like have some useful plugins for my desktop, to write sticky notes, 
to schedule calendar events and TODO tasks. It could be always displayed 
on the screen and better to have option of auto-hide.

What are you recommendations?


Thanks a lot.
-Michael