True,
I see your point, and making groups will be WAY easy, but But tagging will benefit you in the long run, especially if you have quite a few videos. It will allow users to not only view videos in groups that you define, but allow users to view videos in groups they dictate.
Let's say for example, that you have 30 videos, and 1 group is tagged as the following:
Group - A
Video 1: sales, toyota, truck, compare, lesson
Video 2: sales, honda, crv, AC, suspension
Video 3: sales, toyota, AC, suspension, marketing, car
Video 4: sales, BMW, brakes, 2.3_liter, scoop
Video 5: sales, Dodge, truck, 4.5_liter, HEMI, compare
Other videos
Video 6: marketing, suspension, Toyota, Honda
Video 7: advertising, BMW, suspension, 3.0_liter
Video 8: discussions, 2.3_liter, scoop, compare
etc.
After they watch a video in YOUR defined sales group, and look @ the tags, they may want to dig deeper into specific areas, like marketing, or just Toyota tagged movies.
Now, if you are just using the widget as a cool way to show your video, and not have them go to your vodpod profile, than that would be a different story.
Rudy