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Works for me. http://isup.me has something messed up.

isup is hosted with The Planet / Softlayer. My guess would be that Craigslist has blocked that whole netblock to stop scrapers.

Um, Craigslist is a .org, not a .com.

DOS attacks, maybe?

I blame padmapper.

err, no it's not. It pulls up just fine for me.

Craigslist is down