Hi Simon,
as for message boards/mailing lists, try www.grolman.org, he sends
out a newsletter with great party tips.
Club-wise, check WMF, Watergate, Panoramabar/Berghain, Rio (very very
good underground electro club); there's also tips on the
Bpitchcontrol website.
Record store: Dense in Danziger Str. (www.dense-shop.de)
Roland