I'm afraid I don't have a solution - we just use a huge post on our forums full of the rare stuff.
I was curious if any one could recommend an out of game guild rare recipe tracker. With Wrath pending and 100 active accounts in our guild I would like to setup a place for people to post what rare recipes that they have so people know who to contact with out spamming guild chat. Especially if the people that have the recipe might not be on.
I've done that in the past. But it quickly becomes a maintenance nightmare. I was hoping that some one some where had a nice PHP script for it. Oh well. I can put together the list.
Guild Craft : WoWInterface Downloads : TradeSkill Mods is something I saw on WowUI which apparently has an offline sync mode but just isn't working at the moment. So you might want to keep your eye on it to get fixed up.