does your radiator fan come on correctly? does it only come on when the a/c is on? if so, then your fan switch may have gone bad. i have seen cars idle for 30 mins after driving, in a garage and not see the fan turn on once, and it only comes on when the a/c is on(my teg included, and the temp gauge reads normal).

also, what kind of coolant is everyone running? i was running prestone(that was safe for aluminum engines) before my rad blew, so i switched back to honda coolant and noticed that the temp gauge takes a little longer to raise to operating temperature. also, mixing brands of coolant is not good.

btw, a complete flush of the cooling system before the new radiator is put in should help.