This is a style I've been toying with for a few weeks now. Negreanu mainly plays by it. There was also a recent article by Thomas "Thunder" Keller describing it,
www.cardplayer.com. Beavis really turned me onto it by mentioning its advantages in freerolls. I used it in the Latest NP PFO freeroll, and had a commanding lead with it most of the event.
The theory goes that early in an event, you can see A LOT of flops (in the NP event I saw 42% until the final table) cheap. Position loses a little importance, but you still have to be mindful of it. Pretty much any hand that you wouldn't mind getting in the SB is playable. Suited aces, '20' hands, 1 or 2 gap suited connectors, suited K's and Q's (These if you can get in late). Notice, most of the hands I'm playing here are suited, thats add enough equity to them (IMHO) to make them playable. I have been limping in with these alot. And to keep my image about the same (as in "I have no clue what that guy has"), I limp with a lot of the stronger hands that usually get raised PF, such as AJs, AQo, JJ. The bigger hands I will usually raise just to keep their "playable" equity up. Yes, this gives away the strength of my bigger hands, but early in the lower buy-in MTT's, people dont seem to notice that much. Of course, with these weaker hands, I mean only limping. If anybody has shown strength before me, most of these hands are not playable, and the ones that are usually require a reraise. Same with reraises behind me, I do end up folding a good portion of these PF to a late raise, depedning on odds and what the hand is.
Flop play is where you really need some experience to play correctly. You have a crap hand, and you have to play it as such. If I miss, it gets folded pretty quickly. But if you come in with

from MP and the flop comes

then that crap hand just gained a lot of equity (poker stove puts at about 50% vs 3 other "playable" hands). Yes, that's a very specific example, but quite often the flop comes all rags. The problems arise when you talk about kickers, overflushes, and other similar issues. You must read the other players and draw the right conclusions about what they are holding. Thats why people like Negreanu, Deeb, and Hanson play this style so well (Well ok, Gus is a bully too), they can read people very well.
Ok, some of you are going to argue that variance will eat you alive eventually. Possibly, but the thing is with this style, you are not commiting large amounts of chips to any hand unless you have a made hand. Early in MTT's you usually have 100+ bb's in your stack, and usually have at least 75 for the first three levels or so. Limping and then folding a lot of these hands is far offset by the few that you do hit, and stack other players doing so.
Later in the events though, the blinds are getting too large to do so unless you have been able to build a large enough stack (which is the point, but that always doesn't happen). The biggest enemy to this style late is the actual environment changes at the table. People are no longer limping PF, usually pots are no more than 3 way on the Flop. Playing this style gets absolutely clobbered later in events. You will be limping and folding way too much to make this profitable at a semi-aggressive+ table. When this time arrives, you must fall back into a more 'classical' style of tourny play; folding most of your hands, and raising the rest. But by picking up a lot of pots earlier in the event, you should have amassed a decent stack when you hit the back stretch of the tourny.
Ok, opinions?