I’ve just discovered (via Hawk Wings; there’s a nice run-down of the things you can do with DoIt) a cool-looking tool called DoIt for the Mac. It seems you can set up categories/contexts and have the program give you reminders. One cool feature appears to be the ability to link to files or URLs on your computer, and clicking the links take you to that file or Web page. Another allows you to use your Address Book to bring up phone numbers or email addresses when the time comes to make that call or write that message. Still another allows you to bring it all together with a Quicksilver plug-in.