As a recruiter who tries to find candidates who don't suck, your lack of a degree would not be factor in my decision on whether or not to approach you (if it looks like you don't suck).
One thing that really helps a candidates stand out is something that supplements their resume, such as a well written blog. Being able to show sucess in your career and an ability to articulate what you know is a pretty killer combo.
Thanks for the reply, this is probably the kind of contact I was looking for when I posted this, the question is, without a degree (and to be perfectly honest, no real interest in open source) what do I do to make myself stand out, to say hey, maybe we could have a chat over some coffee? to the recruiters at these companies?