I've been working on a series of interconnected Leverage crossovers, based on the premise "Five times Alec Hardison met geeks from other TV shows".

The story so far - there's still an epilogue to come - can be read here:

Part 1 (Buffy crossover) at LJ or at AO3

Part 2 (Veronica Mars crossover) at LJ or at AO3

Part 3 (Doctor Who crossover) at LJ or at AO3

Part 4 (Heroes & White Collar crossover) at LJ or at AO3.

Part 5 (Supernatural crossover) at LJ or at AO3.