BSB - GABF live, Nick/AJ neck crack, Aaron surprising Nick on TV show, Nick singing "Heaven in your eyes"...sadly, I really haven't seen many video clips with them.
*NSYNC - Lion, Jackson5, Janet Jackson tribute (not to be confused with Boobgate *g*), Making of Pop, Titanic (but that's an audio clip)... There are lots of others, I'm sure, but I'm in the process of changing HDs so I have all of my clips saved to CD-Rs.