4chan has been returned to its rightful owner! Everyone make sure you flush your DNS cache; Windows users, clear all cookies and caches in your browser, close all browser windows, then go to Start - Run and type ipconfig /flushdns. A black window should flash as Windows flushes its DNS cache. Now try visiting 4chan, and you should see it restored in all its wonderous glory. (You may still see a cached response if your ISP has it cached, and you may need to wait 24 hours or so for all things to be back to normal.
Hooray for Mootles!
Edit: It looks like 4chan's still not back up. The DNS is correct but it seems as if Moot is redirecting the domain over to Glexia's suspension page. It's weird, but that's as far as I can tell; connecting directly to the 4chan webserver brings me to this location. The nameservers are right... it's just weird. Hang tight.
Edit the Second: http://zip.4chan.org/tg/imgboard.html should still bring you to /tg/ properly.