The example youtube plugin posted on this url:
k2community.joomlaworks.gr/forum/topics/example-k2-plugin-installs-in

Doesn't work anymore after upgrading to the stable version, and so are other little plugins I wrote. I'm sure it's just a little update but could you tell me how too?

I too am having trouble getting the youtube plugin to work - have published it but it does not appear in the extra fields list.