That's crazy! The exact same thing happened to me just before Christmas. Fortunately I was just leaving the driveway and avoided the unpleasant sideways scene on the highway.
I lucked out on ebay and found a 36,000mi front diff in Illinois for $100, cost almost as much to ship it. I haven't managed to get it under the sporty yet as my shop is clogged with motorcycles and I need to shovel like 4 feet of snow out of the way to get in. I'll likely be taking notes and pictures as I go so I can eventually drop the diff an inch or so (adskia has done this I believe) when I can afford to lift it.
I'll try to get a pictorial-type-thingy going for the swap as it seems it's time for front diffs to be imploding.
It might also help to soak every fastener you think you might turn in WD-40 several times prior to disassembly or you might end up buying things like ball joints, diff mount nuts/bolts and so on.
Good luck!
Steve