I think that problems several people (including qspb) have are router specific. As you see from my earlier post I get consistently about 4MB/s (4,3MB/s max) without any gimmicks, which is clearly better than 802.11g.

Though compiling the newest wl12xx module and using the latest firmware could be useful. Atleast we might get real AP mode for our N9's. You can grab the sources (and the firmware) from http://linuxwireless.org/en/users/Drivers/wl12xx if you want give it a try.