Most of your site I love, but I think there are a couple of ways I think the Advanced Item Search could be improved.
1 - Change the way the Weapon Speed is specified. Instead of the current dropdown that shows all weapons under X.XX speed, change it to a similar thing to the Min Level/DPS options, with a textbox to specify the minimum/maximum speed you want to search for. That way, we can search for only slow weapons (for rogue MH, etc)
2 - Change the way the item type is selected, to let us search for more than one type at a time. For example, it would be much easier if we could run one search for Swords, Maces and Daggers and compare them there, rather than having to run three separate searches. A style similar to Thottbot's search would allow this (it has a list which you can ctrl-click - Link) or you could add a new dropdown option, similar to the Item Type/Slot options, with "Usable By:" and then a list of classes, and the search results only show weapons/armour that the selected class can use.
3 - Add an option to Only Search/Exclude PvP items (The ones sold by AV/AB/WSG and Rank vendors) from the results
Keep up the great work guys :)