for the MOST part, any crash that'll destroy a carbon frame would also destroy an aluminum, titanium, or steel frame. for the MOST part.

but the scary part about carbon are the crashes where the bike is NOT destroyed. a carbon tube may show no damage, but integrity may have been compromised which can lead to catasrophic failure later. if you're in a crash with a carbon bike, have a reputable shop check it out.

as far as what to do with a carbon bike with real damage...lots of bike manufacturers do indeed have a crash replacement program and you should be able to get a decent deal on a replacement frame (but it'll still be expensive). calfee does a WONDERFUL shop repairing carbon frames as well...often times, the repaired portion has been claimed to be stronger than the original layup!