increase pre-flop aggression

Just started playing frequent hold'em in the past 3 months. My stats say I need to get more aggressive pre-flop. I like to raise if I'm first in the pot, except for the occasional early pos. pocket pair or suited connector. I will call raises in position with hands that aren't easily dominated. I do not limp with premium hands unless I'm sure there won't be many to the flop (even then only occasionally).

I know I don't bluff enough, but I seem to have bad luck with being looked up with stone cold bluffs w/ total crap cards, so I've been looking to bluff with hands that at least have some shot if I have to take a flop.

Anyway, any advice/tactics for increasing aggression pre-flop is appreciated.

Rentons guide is good:

Part 1: http://www.flopturnriver.com/phpBB2/...oker-39184.htm

Part 2 : http://www.flopturnriver.com/phpBB2/...oker-39572.htm

Part 3 : http://www.flopturnriver.com/phpBB2/...oker-40404.htm

i nearly doubled my pfr when i stopped (open-)limping in ep.