There are still no certifications for 802.11 draft n, and almost none for 802.11a.
Here’s another breakdown, by manufacturer and year. Click on the chart to get a bigger image. This shows that the Wi-Fi enthusiasts have been pretty constant over the years: Nokia, HTC, Motorola and Samsung. Then more recently SonyEricsson and LG. Note that the 2009 figures are only through Q3, so the growth is even more impressive than it seems from this chart.
The all-time champion is Samsung, with a total of 84 phone models certified for Wi-Fi, followed by Nokia with 68, then HTC with 54. This changes if you look just at smartphones, where Nokia has 61 total certifications to HTC’s 34 and Samsung’s 29.