There's some idle suspicion that Google intends to expand their functionality to include sharing of desktop files. This seems pretty likely given their acquisition of Picasa, which included something called "Hello" - an IM-like application for chatting and sharing pictures. Moreover, if they decide to merge this with orkut, to allow file sharing just with your friends network, then that's a pretty compelling offering.
HOWEVER... The orkut terms of service are still extremely unfavorable to the end user. This is not too bad when it just applies to your profile and to chats on their message boards. It is REALLY bad when it applies to other forms of personal content that may be shared using the system.
I blogged this earlier: Link. As I said, this is just idle speculation, but it seems like something we all ought to watch out for.