If you drop by my web site, www.w0pht.org and click on the Amateur Radio page, you will find an option to install a Search plugin into your Firefox browser Search Engine box. The handy little plugin lets you search the QRZ database for who owns an Amateur Radio callsign. If you are a Ham, this is terribly useful in the your Radio shack. If you are not a Ham, please disregard.
I also have a Mac Widget that does the same thing. Sometime soon I will make that available to users of Mac OS X. I may some day even make a Vista (what do they call Widgets again?) widget. But since I would not touch Vista with a ten foot pole, maybe not for a long time. Feel free to take the Widget code and make it work on Vista. Here’s the code, any HTML dweeb can do it.
Something I may actually do is make a Linux version for use with gDesklets.