Oh I know about making it save replays, just didn't know how you ported them to YouTube.Enable replay in the settings menu. Then under the game root folder it should have a folder called replays. Close your game, then just double click the replay files which opens it via WoT. There you can do everything you see.
I just captured it with FRAPS and uploaded it to youtube from there :thumb:
I'll try that with FRAPS later then and see how the upload goes.