Add to collection from Steam/XBox/etc.

I would like to be able to import all my steam games into my collections list.  As well as from my XBox Live profile.  You already access achievements in steam, how about adding those games to a person's collection?

Achievements are updated automatically, and I think this data is far removed from user lists which can only be edited by you. I think this would be tricky to implement when it's already pretty easy to add games to a list manually.