md5

In the past, I have done a lot of research into Rainbow Tables (link) and here is a free solution to cracking a md5 password.

www.md5lookup.com

This tool uses similar methods of finding a password as a Rainbow Table. Basically, it maintains a database of md5 hashes 1-7 digits long (8 for alpha only), whenever you submit a md5 hash, it searches its database for it, speeding up what used to take days with brute force.

The greatest part, it is free to use for everyone, and open source if you want to use your own table.

with the introduction of tables, hash tables, and rainbow tables, encryption is not safe.