It's a busy world up there in space. In fact there are over 18,000 objects over 10cm in size whizzing around. Goodness knows how many sub 10cm there are. This BBC article articulates the problem quite well although I think it's quite biased to western nations. There is no mention of China or India etc - I'm sure they are equally interested. However looking at where the Space Surveillance Stations are based there are few in the Far East. I wonder why this is?
This ESA site charts the accumlation of space debris from 1957 to 2000.
Now all we need is a space hoover.