Other Nifty Things:
 
I am the unwitting star of a (PG) romance novel, Love's Design by Jillian Dagg. This cracks me up.
Mars Today (The pictures seem up to date but the text is not.)
Are we in an El Niño or a La Niña condition this season?
Where is the magnetic north pole now?. Also check out Geomagnetism at the GSC and The NGDC's FAQ
I'm working with a group that's surveying martian dunes. Our dune database is available at the USGS Public Site in many different formats.
If you decide to go bad, make sure you take appropriate precautions. Same goes if you're a natural follower.
Get daily updates on NASA from NASA Watch.
Do particle physics from your own home, on the cheap! Construct your own cloud chamber. No, make your kids do it for you!
Watch the nifty geology animation of the week.
See some rocket paraphernalia, most of which is cheesy but some of which is cute and even cool (I adore the teapot!).