I want to ensure that whatever I end up with is unique and non-infringing, but I can't trust myself not to subconsciously plagiarize.
Second best option is to do a keyword-based search in logotype databases such as http://logolounge.com (though this one wants $100 in annual access fees).
Simplicity will be key for personal logos I'd think otherwise it would become something like a family emblem.
The question, though, could just as easily apply to a startup logo.
Right now, the design I've sketched is a stylized version of my initials. Should be simple and flowing, once I work on it a bit.
[1] http://www.codinghorror.com/blog/2006/04/your-personal-brand...
edit: I suppose it could be thought of as a modern, personal (instead of family) coat of arms. Right now I have the glider [2] in these sorts of places, but I'd prefer to have something that belongs to just me, rather than a group of people.