YouTube has stepped up their mobile efforts by delivering a streamlined version of their app that is up to 90% faster and optimized for most WinMo and Symbian Series 60 devices.
This 90% figure means much faster starting up, searching and video loading. The video quality is also automatically optimized for your 3G or Wi-Fi network. If you are using a Nokia/Symbian 60 device, YouTube has provided the following compatibility list:
5320 XpressMusic, 5630 XpressMusic, 5700 XpressMusic, 5730 XpressMusic, 6110 Navigator, 6120 classic, 6121 classic, 6124 classic, 6290, 6650, 6710 Navigator, 6720 classic, E51, E55, E63, E66, E71, E75, E90, N76, N79, N81, N81 8GB, N82, N85, N86 8MP, N95, N95 8GB