I think mediamonkey would do well to include specific auto tag from web functionality for videos, TV shows in particular
For TV Shows,please do something similar to TVepisodeRenamer (binary)- Open source, abandoned last year, gets its information from epguides.com, works VERY well for renaming files once the series has been selected (just wish i could add the information to tag instead of renaming the file)
For Movies you could use tmdb.org for movie information (i cant find an implementation that works well at this point, but im sure you guys can come up with something)
for Music Videos there isnt really a good source of information, there is a very outdated mvdbase.org, something that would work with more accuracy is to split the audio track off (possibly ignoring the first few seconds as they are more likely to be a setup for the video) and upload to a shazam like site
Music Videos aren't really that important (given difficulty and probable licensing costs for accurate,complete metadata) but adding a tagger for TV and Movies would make almost as easy to organize videos as music which i think was the goal when video was included in mediamonkey 4 no?