Pitching or de-pitching mp3s ?

[vodkatonique]

Does anybody know where I could find a free or shareware audio editing software that has a pitch function ? I'd like to be able to slow down some of my house tracks and/or speed them up, then record the file to my computer. I can only find that function in virtual turntable software like DSS DJ, can it's no use for me, since I don't want that function for mixing purpose. I said mp3s but actually any format would do.

[MixMasterMax]

Easily acomplished with Non Linear Editors. Also many other functions such as volum, pitch, pan echo, reverse, mute, fade (in-out)...you get the picture.

[K-Bee]

Seems to me that what you really need is some sort of tool with Time Stretching abilities. (ie changing the track tempo without altering the pitch). It's a great tool for both remixing and doing megamixes on the computer.
Both software tools such as Cool Edit Pro and Acid Pro can do that for you - the downside being that none of these are free. :(