I've got a couple suggestions for the page layout. As they are significant changes to the current layout I decided to purpose them here in order to get some feedback (if anyone reads this).
It would make more sense to order the instances in the opposite direction as they are now. Currently, the order is Karazhan, Gruul, Magtheridon, etc. As more guilds make progress in the later instances it would be nice to have that info up top instead of the 800 guild Karazhan listing. I purpose the following order: Black Temple, Battle of Mount Hyjal, The Eye, Serpenshrine Cavern, Matheridon's Lair, Gruul's Lair, Karazhan. Any later instance would be added to the top.
Using HTML style markup for the tables seems more straightforward and easier to edit. I might be biased, but it can't be any more difficult (and imo easier) for people to edit than the wiki pipe markup.