The youtube app kinda blows chunks imho but here's a trick. Navigate to youtube on your pc and get a list of full-length shows (it's possible, just be determined). Now when you have the list you're interested in on your pc screen, email the link to yourself and open it on your droid.
For instance, here's a list of full length PBS Nova shows http://www.youtube.com/show?p=rJP5gz...3ED344F692B650
If you email that link to yourself you should be able to view those shows on your droid. What else can we get? Got any choice discoveries?