I'm a fan of a LOT of slash, so here's my list (all canon or semi-canon):
Top 10: 1. Luke/Jon (The Living End)
2. McDean (JP/Craig Hollyoaks)
3. Fraser/RayK (Due South)
4. Tobias/Christopher (Oz)
5. Jimmy/Coop (Cold Case)
6. Yukito/Touya (SCC, my first)
7. Walter/Jarvis (Wilby Wonderful)
8. Jack/Ianto (Torchwood)
9. James/Donald (Our Sons)
10. Matt/Brian (The Event)
Mark/Scott (Save Me)
Joe/Billy (Hard Core Logo)
Angel/Spike (Angel)
Jack/John (Torchwood)
Mark/Alex (As If)
Ted/Emmett (QAF)
Deniz/Roman
Max/Iago (El Cor de la cuitat)
Donner/John (Johns)
Matthew/Theo (The Dreamers)
Tony/Maxxie (Skins)
Tony/Syd
Christian/Aaron (Latter Days)
Mulder/Krycek (X-Files)
Bayliss/Pembleton (H:LotS)
Kellerman/Lewis (H:LotS)
Martin/Tom (Hollow Reed)
Cliff/Butch (Sugar)
Maurice/Alec/Clive
Non-canon:
Castiel/Dean (Supernatural)
Sam/Ruby (Supernatural)
BJ/Hawkeye (MASH)
Mylar (Heroes)
Petrillicest
RyCol (Ryan/Colin from WLIIA?)
Rocky/Marty (Mean Creek)
Master/Doctor (Doctor Who)
McShep (LOVE!)
Hilson (House/Wilson)
Illya/Napoleon (Man from U.N.C.L.E.)
Lupin/Sirius
I'm a fan of a LOT of slash, so here's my list (all canon or semi-canon):
Top 10: 1. Luke/Jon (The Living End)
2. McDean (JP/Craig Hollyoaks)
3. Fraser/RayK (Due South)
4. Tobias/Christopher (Oz)
5. Jimmy/Coop (Cold Case)
6. Yukito/Touya (SCC, ...