Wow! This is the kind of feature I have been wanting to see for a long long time. It's going to save sooo much time, not having to open all those seperate applications to view something. I really hope apple will be supporting a lot of different formats like adobe illustrator files(?) But it's already great that it supports word and excel files. Usually when I open these I don't have to edit anything anyway. Would be nice especially if it was integrated in Mail as well. Definately my favourite feature.