Pure joy...

Apart from that, though, I promised links to rhymer23's Avengers stories. :-)

Immortal Engines
Steampunk!AU - Excellent long plotty genfic where the Avengers come together to defend a 1878 America that never was.

Five Authors Who Didn't Write The Avengers
"Five authors rather unwisely allow various of the Avengers into their nicely ordered fictional universes. Mayhem ensues. Also heffalumps, mead, swooning, soliloquies, and some very grumpy wizards."
I think the one where Tony Stark crashes the Council of Elrond is my favourite, but it's a close run thing. :-)