I'm most often KillerKarma (sometimes thewhitedragon69) on Cockatrice. I'm mainly into Modern, Vintage, Old School (in that order), but dabble in legacy on rare occassion. I'm on Cockatrice almost nightly (Texas central time from 9-11pm mainly). Feel free to add and PM me and we can play any time!
Check out "untap.in" it's a browser-based mtg client that has a small vintage community running regular leagues.
Do you happen to know where the people hosting leagues congregate or where I can find some extra info?