I try to write at least a song a week, of course a lot of them turn out like crap but sometimes...sometimes the ones I like the least when I'm writing/finishing them end up being favorites years later...so yeah, at least a song a week.
Heh, might be worth explaining that my idea of a song is generally a 1-2 minute rough draft, start to finish in about 2-3 hours...I figure I can always go back and re-record it so long as I record all my ideas about it...but somehow I never do. That's why I even consider them songs...because they're done!