Call of Duty 4?

Honestly, I haven't found any really good sites. I'm a 4th prestige and I learned a lot of tricks by playing search and destroy. When you're killed, you're out for the round and observe your teammates. Watch a few gold crosses and you'll learn all types of things. Plus, search and destroy is much more realistic and challenging (i.e. It's important to avoid getting shot).

That's the best tip I can give you. It's made me a much better player.

Can't go Prestige until you fill up the exp after lvl 55.. so it's like you can't go Prestige till you hit "56"

Edit: Sorry I think I misread the question.

My biggest tip I can give is not to rush into situations. For me I usually do when I'm having a bad game and I get frustrated, which ends up getting me killed even more.

You can also go to gamefaqs.com if you want to read about a bunch of people bitchin' about "perks" ;-)

playstation.com- go to the forums and look up 'call of duty series'

-i check it at least once a week to see if there is anything somebody is trying out that i want to give a try.

try going to www.gamefaqs.com they have alot of guides