6-table LHE strategy?

[Rudbaeck]

Check out Weighing the Odds in Hold'em by King Yao.
The shorthanded chapter in HEFAP if you play lots of 2-3 handed poker. (Don't do this at lower limits, rake will most likely kill you on most sites. Don't even consider doing it on PokerRoom.)
Jason Pohl wrote some articles which google will find for you.
Ed Miller has atleast one article in the free web magazine on this site.

The shorthanded forums here is where the gold is at though. Read, learn and practice.