Today I've occasionally been getting looping redirects that seem to be involved with the ads (I see burstnet mixed in the URL as it flashes by).
It happens both on the main comic page or on the forums, eventually ending on the 404 Bogroll on the main comic page. (On the forums, I get redirected to the main comic page too).
PS:
Here's the URL I get redirected through:
http://www.erfworld.com/interstitial.html?gr_ads_custom=adurl%3Dhttp%253A//www.burstnet.com/gr/display/s%253D20606/a%253Da/SZ%253D0X0SB/V%253D2.3S/BCPG182546.267954.319455/BRC%253D97971/RETURN-CODE/JS/%3Brunevent%3Dhttp%253A//www.burstnet.com/event/1/ad20606a/182546/267953/319454/BRC%253D66476&gr_i_re=http%3A//www.erfworld.com/interstitial.html%3Fgr_ads_custom%3Dadurl%253Dhttp%25253A//www.burstnet.com/gr/display/s%25253D20606/a%25253Da/SZ%25253D0X0SB/V%25253D2.3S/BCPG182546.267954.319455/BRC%25253D44432/RETURN-CODE/JS/%253Brunevent%253Dhttp%25253A//www.burstnet.com/event/1/ad20606a/182546/267953/319454/BRC%25253D59330%26gr_i_re%3Dhttp%253A//www.erfworld.com/interstitial.html%253Fgr_ads_custom%253Dadurl%25253Dhttp%2525253A//www.burstnet.com/gr/display/s%2525253D20606/a%2525253Da/SZ%2525253D0X0SB/V%2525253D2.3S/BCPG182546.267954.319455/BRC%2525253D87027/RETURN-CODE/JS/%25253Brunevent%25253Dhttp%2525253A//www.burstnet.com/event/1/ad20606a/182546/267953/319454/BRC%2525253D77178%2526gr_i_re%253Dhttp%25253A//www.erfworld.com/interstitial.html%25253Fgr_ads_custom%25253Dadurl%2525253Dhttp%252525253A//www.burstnet.com/gr/display/s%252525253D20606/a%252525253Da/SZ%252525253D0X0SB/V%252525253D2.3S/BCPG182546.267954.319455/BRC%252525253D72773/RETURN-CODE/JS/%2525253Brunevent%2525253Dhttp%252525253A//www.burstnet.com/event/1/ad20606a/182546/267953/319454/BRC%252525253D26566%252526gr_i_re%25253Dhttp%2525253A//www.erfworld.com/forum/index.php