Bands

http://www.hoodoogurus.com/

Tab

http://www.tabcrawler.com

Fellow Lefty Rock Stars

Jim Dog: www.somedogs.co.uk
Willie Duncan's fantastic collection: www.willieduncan.de
Stephane Boucher: http://pages.infinit.net/stb
Pye Palm: www.collectorswc.com
John Edgar: www.storyjohn.freeserve.co.uk

Communities

http://www.leftyguitar.com/

'Causes'

http://pages.infinit.net/skibble/lefty.htm

Shopping

http://www.surprise.com/traits/left_handed/lefthanded_guitars.cfm

Retail

http://www.southpaw.net/ - sample of US prices
http://www.lefthandedguitars.co.uk/ - sample of UK prices

I have no affiliation with any guitar manufacturer or retail outlet