Launchy
Just hit "Alt+Enter" and fireup your app. Recognizes all installed apps and adapts itself.
Tomboy Notes
Use a shortcut like "Shift<F1>" and you paste your notes with a heading. Press Esc and forget about it(automatically saved). You can get it along with all the other notes with another shortcut key.
GTD Timer
The best timer/reminder app I have seen till date. Trial version.. 😦 Inspired to write my own app based on this. Design already done!
Windows Live Writer
Again the best for maintaining multiple blogs! Surprising to see such a product from MS. I think most of us have it installed with as part of "Windows Live"
Google Chrome
Those willing to try it..can go ahead..very excellent interface..except "on the fly bookmarks" 😦 Badly missing this feature.
StickyPad
This piece of software from greeneclipse software is a real gem. The UI is good and has a very high usability index.