The Ancestry.com website is running a freebie for a few days, at least until September 3. You can search all of the U.S. Census through 1940 for free. Check it out!
I've been hitting it pretty heavy lately. By the way, I put most of my genealogy files on a flash drive and back it up to my laptop and desktop regularly. I found out the hard way the dangers of pulling the flash drive out without formally ejecting it. A bunch of the just downloaded files got scrambled. Sigh. I did manage to recover them, though, with a free program I downloaded from CNET Downloads: PC Inspector File Recovery. It worked very well. I had backups anyway of most of my data, but I had just downloaded a dozen census images and didn't want to have to do it twice!
Have fun!
