http://www.watfordvalves.com/soundfactory.asp
The thing I like is the play the same passage on the same setup, only changing out the speaker. I think it's usability for getting a good sense of the speaker is better than most speaker demos. Covers several different brands. Check it out.
That is cool. I liked the Fane 12L (probably a copy of the old EVM12L), too bad they used a different tune and settings to play it.
Weber 12" Cermaics, both, FTW IMO.
I also love the sound of greenbacks... pretty much all the greenbacks sounded pleasant to me.
I think I liked the F150 out of all of the Webers. Tasty.
I love websites like this one!
I'd like to see a similar one where they take a guitar and put all sorts of different pickups in it (actually, preferably a full set with more than one guitar - for example, a Les Paul and a Strat).
It really helps to understand the differences before you buy. :)
Duncan used to have samples like that. They were pretty useless though... something about the passages they played, it never seemed to work. Also, with pickups, you can raise a pickup two or three screw turns and it gets a lot hotter. I think it's just tougher to do. In this situation, you record the track dry once, and then you can run it through every speaker you can find and it's truly the same thing every time.