Calculator + SlickRun

I use SlickRun: a free floating command line utility for Windows. SlickRun gives you almost instant access to any program or website.. I also find useful the Google calculator. So when I'am on line I can simply type "google 7*4" (or some more complicated calculation) in SlickRun and the result returns back in my browser!
Still better, there is a built-in calculator in SlickRun you can type "=7*4" and you got the result also if you are off-line.

Password generator

If you are tired of remembering all those passwords or if you feel pain to use the same password everywhere then you should check this Password generator.