A H.

This site has a lot of information about IRS deductable mileage rates, with a free mileage log sheet and for-sale log books to help.

Whenever my internet speed is slow, this is where I go to figure out if it's a local or regional problem.

This site is of great help help to network administrators and email spam busters. I've used it a zillion times to figure out where an email really came from, to figure out who really owns a website and where it is, and to make sure that the DNS on my own websites is setup correctly.

As an IT professional, this is one of my favorite little websites. Granted the main thing it does is to merely give you your external IP address, but it has other little tools on the site that will help anybody who manages networks.

The Spectrum-Research.com website promotes the firm's web based employee time clock software, but also contains numerous resources like their sales tax chart generator, and more.