Finally I am in a band that are going to play south London, but not too far south: only as far as Stockwell, which means easy to get to on either the Northern Line or the Victoria Line, so I'd hope that you 'north of the river' types can make it.
Full details below and there's even a link to the flyer.

Venue: The Grosvenor in Stockwell
Date: Thursday 8th March, 2007
Time: 8pm
Google Maps Link: http://maps.google.co.uk/maps?f=q&hl=en&q=SW9+0TP
Flyer: http://theogb.com/pocuswhiteface/flyers/flyer-20070308.jpg
THE GROSVENOR, 17 SIDNEY Rd., London, SW9 0TP
We're on second at 9pm SHARP: curfew means we can't be hanging around so aim for getting there at least by 8.45. There are two other bands after us and I'm afraid we have no idea what any of them are like so we'll be as surprised on the night as you will...
The flyer gets you in for £4 instead of £5:

http://theogb.com/pocuswhiteface
http://myspace.com/pocuswhiteface