Short-handed game, I raise all of these.

10 handed, as follows:
I've played TT both ways (limping and raising), and over 15k hands, it has never left my top 10 most profitable hands.

JJ, on the other hand, used to be losing me money. Since I started limping it, it's now slowly going up in value.

AJ, I limp (as I believe this gives me the most complete information). Most hands that call a raise beat you, and most hands that beat you will raise. If it's raised behind you, resort to reads on the player. You can get away from a losing hand against tight players and trap loose players pretty well.

AK on missed flop, I don't even always bet. I mix it up so that people don't think "well, he's raising on this just as a continuation bet." That lowers the amount of people who will come over the top of you the times that you do continuation bet (making it easier to lay down). Further, it allows you a check-raise opportunity if you find a player who will make a play for it w/o the cards because of your checking.

I'll almost never play T9o/98o, unless in the big blind or with less than 5 people.