Welcome to the fandom! I lost my SPN bookmarks in a recent laptop catastrophe, but there's a newsletter that's very comprehensive:

http://community.livejournal.com/spnnewsletter/

along with a gen community:

http://community.livejournal.com/spn_gen/

and a comm devoted to fic featuring Bobby Singer:

http://community.livejournal.com/singer_salvage/

and a crossover comm:

http://community.livejournal.com/sn_crossovers/

Also check the SPN recs over at Crack Van:

http://community.livejournal.com/crack_van/

Happy reading! :)