Rainbowcrack and MD5 cracking
"md5er" has set up a quick website and system to crack md5 hashes online using Rainbow tables. According to him, the project is using RainbowCrack and currently ~47 Gb of tables. At the moment it can crack hashes of lowercase letters and/or numbers up to 8 characters long. The cracking service is free
If you are interested you can check out the site here:
http://passcracking.com
There have since been discussions on whether this site might fall victim to the slashdot effect. - So it might be interesting to watch it. (see [appsec-research] list)