I think the 1st thing I will cover is what router will play nicely with Server. I'm using a netgear DG834GT with V1.02.13 firmware, version 14 messed up the port forwarding. Not all routers will work with the EX475 so do some homework before you decide on buying this unit.
I did have some problems with IP addresses swapping round on the router and when logging on via the web I would get my printer web page, this was easily fixed by creating static IP's.
I set up the EX475 using a vista powered laptop which was dead easy and straight forward. Basically insert disc and follow screen prompts. I've installed one Ad in which is a program called web guide which allows you to stream music and videos over the net.
The EX475 comes with 2 x 500gb hard drives & the EX470 comes with a single 500gb drive, I bought the EX470 and added a Samsung 1tb drive for the same price as buying a EX475, something to bear in mind when your looking to purchase one of these machines.
What else can it do??
Yes of course it's a server and its stores all your files etc, you can choose to mirror your important files onto another drive for safety.
Now the best bit I use it for is the media storage, photo's, video, MP3's etc. I was going to buy a Home theater PC to go under the tv and be able to stream all my films on to the television. I didn't need to as a Playstation 3 picks up the server and will play avi,mpegs,some divx and vob files which are ripped dvd's. It upscales films and really does a fantastic job.
To sum up it is a really good piece of kit and does work well, yes you will have problems along the way and more often than not a reboot will get things going.