I had a ton of time in MW2 (pre-PS3 hack) and I think I prestiged just before Black Ops came out, so I didn't have anything.
I don't think it'll help much anyway. New maps are new maps, plus I can't afford to take time away from BO if I'm gonna stay on my prestige schedule before 11/8/08.
Good luck though, and watch out for those hacker lobbies! They can erase your perks, stats, and emblems if you're not careful. If you end up in a lobby and anything weird is going on, BACK OUT IMMEDIATELY!
That happened to me a couple times, lost all perks, emblems, and weapons because I entered a "challenge" lobby that some hacker had set up.
MW2 is like Dodge City, there are no rules and no sheriff.