[sy_or_bust]

If you expect to see a flop 5-handed or more, you should be raising many suited hands you are going to play. ATs obviously, but even hands like A6s that will win a large pot when you flop a draw (and want other hands to have "odds" to draw to second best hands). I'd raise K9s+ also. Suited connectors 87s+ deserve a raise against a large limping field, as do any pocket pair. You're pushing your equity edge here - even a hand like 44 will hit a set often enough to be raised against 4 or more limpers if you calculate implied odds.

Unsuited hands like AQ/AJ are less clear. I tend not to raise them against a large field, but will raise AQ against 3 or 4 limpers. A lot of this depends on the position of the limpers - you do not want to be raising a hand like AJo when UTG and UTG+1 are tight and limping. You almost always have an equity edge with these hands, but from the blinds the postflop with AQ/AJ is much easier in an unraised pot, so it's a judgment call on which edge is more important to you.

Betting and checkraising are your two weapons, you'll use them as you see fit to either protect your hand or "pump" the pot. If you're unsure about any of these ideas, check out the Microlimit forum.