So far pages I've found which don't hold my login are:
All realm pages (erm, no, I didn't try them all, but a random sample of half a dozen, both US and EU, all gave the same results so I'll assume all

WoW Census http://warcraftrealms.com/census.php
(Side note: Euro realm status http://warcraftrealms.com/eu_serverstatus.php is broken - ddn't even know that page existed tbh, hit it when going through all the menus

(Also /dataexport.php is broken, as it's the only thing under Developers menu, maybe that menu is now redundant)
Using Firefox 23 if that makes any difference, have Noscript but it's set to allow anything on WCR so shouldn't cause problems.