YouTube mobile is now here. This is the latest version V1.04(5) it's a JAD file so it shuld work on many JAVA phone. YouTube says that it only works on Nokia's N73, E51, E61, E61i, E65, N95, 6120c, 6110n and Sony Ericsson's k800i and w880i. It's true, but i can work on others. The Nokia 6220classic can have it but sometimes the video dosen't come up. I've tested it on many phones and it works fine with evryone but best on them that youtube said it works for like Nokia6120 classic.
Hope It Works fine for you, i will upload the latest when it comes a new one!