This is definitely a terrific way for learning new stuff (you have now the HN community watching you). However, don't also forget that for most applications, their success/failure will be also determined by the spit and polish applied on them. Don't get carried away over the "quantity", always be mindful of "quality" too.
I clicked the link, and the random band-picker picked Eagles for me. So the line on the top said "I'm in the mood for Eagles videos", and the video playing under it was Iron Maiden's Where Eagles Dare.
This keeps a playlist of what you liked and uses that to recommend videos, allowing you to personalize and filter down the videos to only what you are interested in.
Example: Searching for "haskell" will give you videos about people named haskell as well as the programming language. After adding a few example videos to your list, you will get only results related to the programming language. The idea is to start to combat the incredible amount of noise in search results: believe it or not, not everyone enjoys rick rolls and gophers.
Update: I read your intention behind this here: http://terrorified.com/?p=786
Now I better understand your motivation. All the best.