I can't remember the first time I went on the London Eye but it was years after they had put it up and I was kicking myself for having left it so long.
There's not really much to say about it really - it goes round and round (1 rotation takes about 40 mins) and costs about £10 and you can see all over London.
The thing that gets me though is that its mainly tourists that go on it when in fact Londoners would get so much from it - if you live within zone 2 you can probably see your house and there are so many things that you notice from way up there that you never notice stuck on the pavement - its great - if only Londoners got a discount I'd be up ther eonce a week.