A good love triangle story always grabs my attention, and for me, the Kate / Sawyer / Jack love triangle from Lost is hard to beat. It has it all - a beautiful girl, and two hot as hell, but different as chalk and cheese men.
Lucky Kate, eh?
Kate is a complex character, her tough life experiences have left her battle scarred and defensive. Sawyer is her equally embittered male mirror image - they are drawn to each other because they understand each other perfectly and are haunted by the same demons. Two peas from the same dangerous pod, they are explosive together, both in and out of bed.
Jack, on the other hand, is Kate's complete opposite. He's responsible, calm and dependable, and it helps of course that he is easy on the eye. He nourishes Kate's soul in all the ways Sawyer can't, he's rock solid and offers Kate safe harbour and security. He meets her emotional needs in a way Sawyer couldn't possibly hope to, and in the end these qualities turn out to be what she needs most of all.
Turning full circle, Sawyer later found true love with the serene Juliet, who shared many of the same attributes as Jack. I know many people were unhappy with the ending of Lost, but for me it shone in the way it crafted characters I really cared about and invested in emotionally.
How about you? What's your favourite love triangle? Just don't get me started on Bella, Edward and Jacob, I could be here for hours...