Yep. The backing track was loaded up to box.net, and the collab was downloaded, recorded on, then uploaded back on box.net for more collaborators.
This one from January, 2008 is a good example.
http://www.thefret.net/showthread.php?t=5557
Here is one where some of the more advanced players ripped it up.
http://www.thefret.net/showthread.php?t=1878
Steve Thompson
Sun Valley, Idaho
Guitars: Fender 60th Anniversary Std. Strat, Squier CVC Tele Hagstrom Viking Semi-hollow, Joshua beach guitar, Martin SPD-16TR Dreadnought
Amphs: Peavey Classic 30, '61 Fender Concert
Effects and such: Boss: DS-1, CE-5, NS-2 and RC20XL looper, Digitech Bad Monkey, Korg AX1G Multi-effects, Berhinger: TU100 tuner, PB100 Clean Boost, Line 6 Toneport UX2, Electro Harmonix Little Big Muff Pi, DuhVoodooMan's Rabid Rodent Rat Clone, Zonkin Yellow Screamer Mk. II, MXR Carbon Copy Delay
love is the answer, at least for most of the questions in my heart. . .
- j. johnson