Notification of Channel Comments That would make things easier to navigate, so you don't have to go to your channel to see if you have been commented on.

Thumbnails I think it's kind of weird we cant create thumbnails. It seems like a natural thing to have.

cosmic panda homepage i mean its pretty self explanatory. no need for a description

Annotations Put annotations

Video searching on channels can you perhaps implement searching for videos on a certain person's channel
along with 3 tabs so we can view the most viewed, most discussed and most recent videos on a channel. - I'm just repeating what @kng said, its a good idea.