This user's name isn't actually the vaguely amusing "FrustratedWithFormsDes" (22 chars), even though that's how it's displayed in questions and answers. The full name appears on the user page and in the comments.
Why is the name truncated in some cases, but not in others? If you don't want to display more than 22 characters, then why allow user names to be longer in the first place?
Edit: Just saw an answer from a user with a 24 character name, not truncated: http://stackoverflow.com/questions/2240575/where-do-custom-build-tools-go-in-your-source-tree/2240616#2240616