I can get 20MBit on my laptop via WiFi.
I can also get that 40-45MBit across the powerline networking into the study, because the desktop in there can download things just as fast.
And I can get around 320MBit between the desktop and the NAS, across the gigabit hub.
Noting purely for my own interests. I am curious as to why the WiFi tops out around 20MBit - It's an "Intel® Centrino® Wireless-N 100" - which should be able to manage up to 150, so even with that being an "ideal, not achievable in real life" figure, I'm slightly surprised that even when it's next to the router it can't manage more. I wonder if it's hooked up internally over something much slower. The router is a WRT610N - and tests show that it can manage 117MBit at close range. I shall have to have a play with Julie's laptop at some point...
Original post on Dreamwidth - there are comments there.