Currently i have these thingies to the network
Running on 2.4GHz
Siemens Gigaset W75 WLAN IP Phone
2 pc's on Netgear WG111T
Atheros AR5007EG
Nintendo Wii
Running on 5GHz
Intel 3945ABG
XBOX 360 Wireless adapter
But next week i will get
2 Intel 4965AGN, to replace Intel and...
Here is how i fixed the wireless issues.
/wireless/basic wireless settings/
Set both 2,4 and 5GHz Radio Band: Wide 40MHz channel.
And the most important I belive is to set
Applications & Gaming/Qos
WMM Support: Disabled
Hope this helps