If you used the jailbreakme.com method to jailbreak your phone then you may have noticed that your youtube doesnt work anymore

...
Well there is a quick and easy fix that doesnt even require a computer....
all you have to do is add
http://i.unlock.no
to your installer apps sources
to add this to your installer app just click your installer app, click on the sources tab, hit edit, and hit add and input the address... then you should see a unlocking tools tab in the install area...
click into that tab and install the youtube activation, restart your phone and boom now you can watch youtube videos to your hearts content
note: there are some other cool tools in the unlocking tools tab also... such as anySIM, EDGE settings fix, Enable International menu, and OneSIM...
enjoy...