Oliveoil - London constantly gets a bashing, so it's nice to hear it getting a cheer for once. I've been told so many times that I'd want to leave once I have kids, and it's just not true.
Whilst, reassuring OO that I think there are LOTS of other fantastic places to live, here's what I love about my London life:
hardly ever using a car
fantastic local shops selling everything from pak-choi, strange yams, posh olives and breads, you name it, we can walk there and buy it! YUM!
the social and multi-cultural diversity
I can cycle into central London in 20-30 minutes
the endless museums, theatres, opera/concerts
my friends - so many of whom live a short walk away