Today's entry is LotR/Disc themed, since those are the crossovers I see them most.
Seven Stars and Seven Stones and One Old Copper: The Bursar likes pink. The Havelock Hurin conspircacy spreads. Nobby gets the Ring. Best. Crossover. Ever. (Unfortunately, it doesn't update much anymore.)
A Matter of Advertising: Speaking of the Havelock Hurin conspiracy, a tinhat's view on how it all started.
And one non-crossover cracktastic fic:
Emotional Baggage Not quite Rincewind/Luggage.