NP

I will update you when I get around to trying it, in the mean time go here and have a read on what the HH can do:
Index Home Hub items
And yes you can have it free standing, as we can still access both ours (Wii, PSP, iPod Touch etc....) when non of the computers are on or connected.
It's really quite versatile, ours (main HH) has the Mac connected (wired, Ethernet port 1) and then it has a Netgear Switch connected into the 2nd Ethernet port with original Xbox, a 360, and a PS2 connected and a Wii through wireless.
The Second one is upstairs connected to one of our daughters iMacs and gives us 100% coverage all over the house.
As with any wireless access security is an issue but once your initially set up I can let you know how we have ours set up.
You can even connect a USB Hard Drive to one....
Regards
Leon