I've read
Connect The Dots, and I seem to recall a good (but unfinished) third season fic where Don had amnesia (well, Millie was in it, so I guess it was third season). Actually, if that one ever got finished, point me in that direction, please.
I'm a sucker for amnesia fic. Full or partial amnesia (ie., fifth season Colby thinks it's 2006 and he's a spy or Larry has no idea who he is or what year it is at all). Anyone can be the amnesiac. Any couple is fine, so long as it's canonical for the time period the story is set in, but I love genfic too. Just not any where Alan think Margaret is still alive - that one's too rough for me.
So, any other good fics out there where one of our gang has amnesia?