Just thought I’d chime in with one that helps me bunches. Evernote http://www.evernote.com/
It is available for PC, Mac, Iphone/Ipod Touch, Windows Mobile, Palm and Android. And they can all integrate together.
Need to remember something away from your PC? Just record it on your phone/ Ipod Touch then it’s available when you get home on your PC.
Very helpful especially if you have a camera on your phone. No need to write it out just snap a picture.
And best of all it is free. 