Blair, Chuck and Nate.
Dan, Serena and Nate/Vanessa

Jate or skate (Jack and Kate or sawyer and Kate)
Brook,Lucas and pyton

well obviously brooke, lucas, peyton.
i also liked watching anna, seth, summer.
and rory, jess, dean.

Brooke/Lucas/Peyton
Anna/Seth/Summer


XD

Brucas/Leyton(OTH)
Pathan/Leyton(OTH)
Dawson/Joey/Pacey(Dawson's Creek)
Brenda/Dylan/Kelly(BH:90210)
Cranny/Crash(Degrassi)
Anna/Seth/Summer(The OC)
Dan/Serena/Nate(Gossip Girl)
Nate/Blair/Chuck(Gossip Girl)
Blair/Nate/Serena(Gossip Girl)

Angel/Buffy/Spike and Dan/Serena/Nate.

i dont like love triangles. they are always so sad :(

Jack/Kate/Sawyer/Juliet

Brooke/Lucas/Peyton

Pacey/Joey/Dawson/Jen

Chuck/Blair/Nate

Lily/Rufus/Bart

Robin/Ted/Barney

Jack/Kate/Sawyer/Juliet

Alex/Addison/Mark

Anna/Seth/Summer

Logan/Veronica/Duncan

Brenda/Dylan/Kelly

Sawyer/Juliet/Kate/Jack

Meredith/Derek/Addison

:)

Jack/Kate/Sawyer/Juliet
Rory/Jess/Dean

Brooke..LUCAS...Peyton
Jess....RORY....Dean
Chuck...BLAIR...Nate ( there's no competiton here..Chair kick asses)
Kate....SAWYER..Juliet

BLP> Brooke/Lucas/Peyton> One Tree Hill
BNS> Blair/Nate/Serena> Gossip Girl
CEF> Cook/Effy/Freddie> Skins
GRA> Grace/Ricky/Adrienne> The Secret Life Of The American Teenager
CGV> Carlos/Gabrielle/Victor> Desperate Housewives

Pacey-Joey-Dawson (Dawson´s Creek)
Jess-Rory-Dean (Gilmore Girls)
Duncan-Veronica-Logan (Veronica Mars)
Effy-Cook-Freddy (skins)

One Tree Hill:
Brooke-Lucas-Peyton
Jake-Peyton-Lucas

Dawson's Creek:
Pacey-Joey-Dawson

Gilmore Girls:
Jess-Rory-Dean
Christopher-Lorelai-Luke

SLotAT:
Ben-Amy-Ricky
Grace-Ricky-Adrian

OC:
Anna-Seth-Summer

Friday Night Lights:
Jason-Lyla-Tim

house/cuddy/wilson
peyton/lucas/brooke
blair/chuck/nate
sawyer/kate/jack
anna/seth/summer

The OC
anna/seth/summer
summer/seth/zac

OTH
peyton/lucas/jake
peyton/lucas/brooke

Friends
ross/rachel/emily
monica/ricahrd/chandler

Dawsons Creek
Pacey/Joey/Dawson

Jack/Kate/Saweyr/Juliet
Peyton/Lucas/Brooke
Addison/Mark/Alex
Alex/Izzie/Denny
Rory/Jess/Dean

Rory/Dean/Jess (Gilmore Girls)
Joey/Dawson/Pacey (Dawson's Creek)
Blair/Nate/Chuck (Gossip Girl)
Dylan/Brenda/Kelly (BH 90210)
Haley/Nathan/Chris (One Tree Hill)

McDreamy/Addison/Mark (Greys Anatomy)
Peyton/Lucas/Brooke (OTH)
Alex/Izzie/Denny (Greys Anatomy)
Cook/Effy/Freddie (Skins)
Puck/Quinn/Finn (Glee)

Damon/Elena/Stefan (The Vampire Diaries)
Jack/Kate/Sawyer (Lost)

Nate/Chuck/Blair

i agree with Seddie4Ever romantic
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I don't really like love triangles, although it makes it dramatic they often end sad...

Damon/Elena/Stefan (The Vampire Diaries)
Logan/Veronica/Duncan (Veronica Mars)
Dan/Serena/Nate (Gossip Girl)
Puck/Quinn/Finn (Glee)

And my favorite AU triangles:
Chuck/Serena/Nate (Gossip Girl)
Elena/Damon/Bonnie (The Vampire Diaries)
Lucas/Brooke/Julian (One Tree Hill)

Lucas/Brooke/Peyton [OTH]
Damon/Elena/Stefan [TVD]
Nate/Blair/Serena [GG]
Dan/Nate/Serena [GG]

Nathan/Peyton/Lucas (OTH)
Brooke/Lucas/Peyton (OTH)
Dean/Rory/Jess (Gilmore Girls)
Dean/Rory/Tristian (Gilmore Girls)
Emily/Ross/Rachel (Friends)

Jack/Kate/Sawyer (Lost)
Peyton/Lucas/Brooke (OTH)
Stefan/Elena/Damon (VD)
Dan/Serena/Nate (GG)