It's been #1 top story on Reddit for some time. There's rorr.im mirror[1] and some old version without images in CoralCDN[2].

Perhaps most up-to-date and reliable alternative at the moment is actually their Twitter feed:

http://twitter.com/arabist

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[1] http://news.ycombinator.com/item?id=2151054

[2] http://www.arabist.net.nyud.net/blog/2011/1/28/urgent-egypt-...