I just got a 20MBit cable connection at home and tried to measure the bandwidth from this with my laptop. After a few tries (5), I could see I was getting 14/1 Mbps (down/up) speeds from speedtest.net
That was faster than my old 12Mbit connection (which measured 11.5/1) so I knew my provider did upgrade my connection, but I wasn't able to get all the speed I thought I would have. So instead of using the wireless connection, I tried using a regular ethernet cable and measure it again. It measured 19.5/1 which I believe is pretty close to the speed I was looking for.
The wireless router I'm using is a WNR2000 (version 1) from NetGear and a Intel WiFi Link 5100 from a VAIO Z520 (which has a gigabit ethernet lan port too).
I don't really know what else to do: router firmware is up to date, as is my wireless card driver. Windows says the connection is at 54Mbps, with all the bars for signal strength. The router is about 45 centimeters away from the notebook, so I don't think it is a signal strength problem.
Does anyone know what else I can try to get the best speed from my wifi?