This is always a lot of fun. I try to watch as many college games as possible during the year, and while television isn't the best for football scouting, it's more than adequate for my purposes.
You see, I know less about football than I would like. I am a movement artist, however, and I understand bio-mechanics pretty well. Instead of breaking down scheme, then, I do my best to analyze the quality of a player's coordination and body control, explosion, and overall athleticism. If I then see the requisite attention to detail (playing within the scheme, etc), along with the right size and mindset, then I flag the player as a Patriots type prospect.
I'm quite comfortable choosing players that will do well at the next level, whether with the Patriots or with someone else. The one year I did fantasy football, I chose an all-rookie team. My friends laughed at me, but I ended up with a winning season.
My way certainly isn't foolproof, but it does bring a completely different perspective to the table. It's just one resource, and I hope some of you find it useful.