tip #1: listen to Osmann and Titans4ever
some scattered info in no particular order:
basically like osmann said position is very important. Never raise from early position.
starting hands are like those listed above^^^ connected and double-suited cards are very strong: 6789, AKKJ, AKQJ and hands like that
Pocket pairs are only really valuable when you make a boat with them or a set with the board showing no flush or straight possibilities (which is rare).
hands that are rare in holdem are now much more common in OH. 2 pair and trips are not strong hands if there is a flush/straight possible, as someone will most probably have one of the two made.
DRAW ONLY TO THE NUTS. Never draw to the lower end of a straight or a 2nd best flush, and sometimes you'll have to pull away from underfulls if you're taking alot of bets in front of you because someone very well might have an overfull to have you beat.
from Supersystem's PLOH section:
there were once two poker players who went broke from chasing the lower end of straights; one because he constantly chased them but missed, the other because he made them.
generally when you are ahead in a hand and want to raise, you raise the maximum (the pot).
and just like in holdem draw only if you're odds
are in your favour