Fair bit depends on the site and table.

I've been playing a mixture on Party, Stars and Pacific at the 10nl levels and it's crazy how you can raise AA like $1 at Pacific and get 3/4 callers, whilst raising it to 0.3c at Party just steals the blinds. Mind I'd rather steal 15c than loose a stack because I limped and let five others see a flop.

Observing the table whether it's tight/loose usually decides how I play them, mind whenever I've got Aces, I dont want more than two callers and I've lost enough limping with them so dont bother with that anymore.