It's simultaneous dual band 802.11 a/b/g/n - I use the wired for my TV / PS3 / ATV2.
There are a couple of laptops, iPhones, iPad, iPod Touch and printer working off the wifi.
The modem I use is the stock Vodafone unit that came with the plan I'm on... I'm sure I could get performance by changing it... but... meh. Works fine.