I feel compelled to point out that Woot.com is a one-deal-a-day site, so it being a dupe is unlikely unless it was posted the same day, and it could be located on the Woot page easily.
Worst case scenario, you could have just searched "woot".
However, having the model number floating around is not a bad thing either for convenience.
On an aesthetic note though, I think its better to place them in the description 95% of the time. I find it more pleasing to the eye, and easier to read the title, when a bunch of oddball numbers and letters are not clogging it up. (Sometimes cut and paste is not enough with some titles.)