Dammit! Now I'm afraid to ride tomorrow.

What does it look like from the inside?

Put a boot on the inside between tube and tire. Works fine.

you should see one of my tires... put that sucker on the rear-wheel.

What's it like inside -- did it cut through the casing? If it's just tread damage, I wouldn't worry about it. If only a few threads of casing are cut, it's probably good for quite a while. If a lot of casing threads are cut, keep an eye on it when you pump it up -- enough casing damage will let it start to bulge and spread.

Modest casing damage can sometimes be repaired with a hot iron and Melco seam-sealing tape, the same sort of stuff used for drysuit fabric seams. It adheres to the undamaged casing around the cut, unlike a boot that simply rides between the tube and the cut but does not restrain the cut casing.

Oh yeah, it's not like I'm going to toss it. It just upset me, I got these fancy pants Schwalbe Blizzards because I was hoping they would be tougher than my Vitoria Rubino slicks.

Also, I discovered it during my nightly pre-ride check. Too late to fix it then. I need my sleep!

Thanks for the tips anyways guys!