Can this stream from iTunes in the same way the airport express can?

I want 3 things from this product, can it;

1) Stream iTunes from pc's/macs/iOS devices to a stereo like The airport express can?
2) Can I plug in a regular USB hard drive and access it wirelessly from various pc's/macs?
3) Can I share a printer through this whilst doing all of the above at the same time? (pretty sure this is possible-confirmation would be great)

Thanks in advance!
PS if you know how easy/difficult it would be to do all of the above(with initial setup from Vista) please rate it out of ten, let me know! Thanks.

QA AirPort Extreme Base Station

QA AirPort Extreme Base Station

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