The Secret Service is into the decryption game (article) and its this kind of thing that makes me love computer security. Long story short, the SS has developed an app which scours the non-encrypted parts of a target's hard drive and creates a dictionary of terms from it that can be used to brute-force any encrypted portions. Even better, the software uses your browser bookmarks, follows them to their target sites, and uses those sites to expand the dictionary of terms. This gives them a focused corpus of words to attempt first, under the assumption that none of us is any good at picking or remembering passwords and we all use familiar material to help us.
I wonder if criminals use de.licio.us?