I subscribed to Netflix for mainly their streaming service.  You can simultaneously stream on all your home devices (PC, iPad, Xbox360, PS3, media center, blue ray players).  I'm not sure if there is a "live connection" limit per account, probably something to test out.  I found this cool and useful at the same time.  Though realistically I probably haven't used it to it's full worth.

Considering bandwidth and licensing costs I'm sure this is a cash flow negative proposition, even if they aren't streaming their best content.  Interestingly enough, this article about Netflix's future business plan showsthat they are serious about digital streaming:

If this is the case, I wonder why some titles that used to be available streaming are no longer there.  Netflix has 12M+ subs and at $10/mo we're talking $1.44B of revenue per year.   If they are serious about streaming, they should be coming out with more titles faster, and not removing some.  

It's great though that they are able to self fund their own transition as the "unlimited" streaming model will migrate into probably a different pay setup once they have enough market share, and the day physical media goes the wayside.  You have to give them credit for not being stuck in their ways.