Go to the linked URL. Watch the nightly Webkit build crash. Wheeeee!!!
Created attachment 201596 [details] crash log
Are you still seeing this? I could not reproduce with r150284 nightly.
I can still reproduce this reliably with that url with nightly r150579 on 10.8.3 with Safari Version 6.0.4
Hmm. Do you have any extensions installed? Does this happen without extensions? <rdar://problem/13548820>
Interesting, it doesn't reproduce here on my MacBook Air, only on my (work) MacBook Pro. I will have to double check after the weekend, but I don't think I have any extensions installed.
Got it: To reproduce the crash, an instance of the Web Inspector needs to be open when going to the URL.
And it only seems to crash with the "WebKit Web Inspector". (Yeah, I'm one of those guys...)
Created attachment 202833 [details] r150579 crash log
Looks like this got re-filed as bug 117280 and fixed there. *** This bug has been marked as a duplicate of bug 117280 ***