If you like cool and unusual photos be sure to take a look at the 2008 Nikon Small World competition site. You can view lots of lovely pictures of things found under a microscope and vote for your favorite ones. You don't even have to focus the microscope!
One of my favorites is the tubeworm larva. It looks something from outer space.
There's even a contest to identify some of the more unconventional images. I only got three out of five. ;-(
You can find them at www.nikonsmallworld.com