I'm not sure these would qualify, but then I have a few signed decks:
Bee Split Spades - David Blaine
New Fan Back - Zenneth Kok
RJRTC - Erik Mana
Blades (all sorts) - he who must not be named
Gargoyle Expo - Lance Miller
Bicycle Pirate - Eric Duan
Crown Deck 1st (all colors) - Alex Pandrea
v5 - D&D
v6 brick box - D&D
Artifice - Jason Brumbalow
Diamond - Diamond Jim Tyler
Fournier 605 - Lee Asher
Karnival Dose - Sam Hayles
Dr. Leon - Hiro Sakai (Dr. Leon)
Bicycle Stickman - Richard Imbrogno
White Lions - Dblaine
Bicycle Cupid Reprint - John Aragi
Bicycle Premier - Michael Ferrante
Bicycle Enigma - Martin Adams
Bee Tech Art - CardConjurer
Arrco Tahoe Reprint - Adam (forgot the last name :/)
Also, I have some coming:
Bicycle Clot - Edison Chen
Bicycle Johnny Cupcake - Not sure who signed it
Bicycle Steampunk - Alex Baldechi
Bicycle Brimstone - Russell
Uncuts:
v5, v6, IAOCP, Fantastique - D&D
Fulton's - Fulton's & D&D
Arcane Uncuts - JBone
That's about it.