Well out of both Full Tilt and Hollywood, i've won the most at the latter. I stupidly chose the $1000 + ipod nano signup bonus with HW though, and i've now realised how hard it's going to be to clear - it gets released in $200 increments...yet even after playing for just over 10 days, i'm only 1/3 of the way to clearing the first. But still, surely i'll clear it within a month so it'll be around the same as I had from PKR as rakeback p/month

About Full Tilt though...it's a whole different ballgame to PKR, so I suggest during your first few session you drop down a limit, just to get into the swing of things.
You definately need to play more than one table there though, depending on how many monitors you've got i'd say 3 to 5 open tables. Personally I play 3 on FT and then 2 on HW (chunkier software) on two 20" monitors.
And regarding the FT deposit bonus, at the $100 NL tables i'd say I clear $40 of the bonus every 4 hours I play. So in theory it's going to take me just 15 sessions to clear the full $600...amazing!