Since I'm a fan of web data portability, there are a bazillion ways you can get digests of your Pownce data.
For contact lists, there are 3 ways: via XFN on your friends page (http://pownce.com/leahculver/friends/), via the API (http://api.pownce.com/users/leahculver/friends.xml), and now via a FOAF file (http://pownce.com/leahculver/foaf/).
When Brad asked to have Pownce support FOAF in particular and I did a lot of searching on the internet for super simple RDF FOAF generators.
Turns out the internet is full of parsers and rather devoid of generators. Ponder that for a second.
Anyways, rdflib does a great job of both but it was tough for me to find any examples of FOAF serialization (besides the image on the front page). Whenever I think it's difficult to find something by a quick internet search I feel like I should post something about it.
So here's my FOAF generator: foafutil.py
Note that the user parameter is a Django User model with a custom UserProfile. You can probably easily swap that out with whatever class you're using to represent users. You could also add more fields since this is a pretty bare-bones example.
Update - Per Tom Morris' suggestion, I've updated the rdfs:seeAlso links to URIRefs.