Below are my recommendations:
A - Link On Profile Page of Members - A great convenience feature would be to have a link on member's profile page that says something like, "View [member name] Videos". The link will then take the visitor/member to a page that list a link to all of the posted videos by the respective member.
B - Link In User Control Panel - Similar to the link mentioned above except this link will be in the respective member's User Control Panel. It can be in the same area that displays the link that says "Show Your Posts". This way members can easily find all of the videos that they posted.
C - Option For Multiple Video Parts - I love the fact that you added the option to allow YouTube embedding. However, it would be really nice if there was an option to add different parts to the video... since many of the videos on YouTube have multiple parts and/or there will be a limit on the size of uploaded videos.
For example, on the 'add video" page, under the "Category" field there can be a drop-down menu or something that the poster can select for the number of parts to the video... which will then add the respective fields.
Adding the multiple video parts option will allow members to have Part 2, Part 3, etc. without having to start a whole new video topic/post - and have to retype a title, description etc.. This convenience feature would make a world of difference... Especially to the person that's viewing the videos. The'll easily be able to continue without searching for the other parts. In fact, you'll have a 1-up on YouTube!
D - A Quick List - Have a drop-down menu on the main "OurTube" video page that lists all of the posted videos in alphabetical order. This will allow members/visitors to easily find videos that they might be interested in and/or that they didn't get a chance to finish viewing.