ahh, road rash, the scar on my leg tells a story like that... luckily I didn't have my guitar with me... actually, I did this before I was even playing guitar.. but still...

and I would also like to know how on earth you fell off a bike, landed on your guitar, and slid, and the thing only has a crack in the headstock??? that's got to be one tough gig bag!!!

and I'd recommend a hardshall case when you get your new guitar, just attach some shoulder straps to it somehow, and you're good to go, then if that ever happens again, then guitar will probably still be in one piece after the fact (don't know what kind of condition the case woul be in, but who cares, as long as the guitar walks away without a scratch)