Usability 
NBC seems to have the biggest and most feature rich Winter Olympics site. It has news, photos, videos, live results, schedules, medal counts, athlete profiles, video, polls, trivia, TV and online programming grids and Vancouver information. You can sign up on the site to receive a variety of free Email and SMS alerts (US Only) and to customize the mobile site content to emphasize your favorite sport.
NBC also promises free iPhone and BlackBerry apps that are "coming soon". With the games five days away lets hope that's real soon!
There are about six stories covering today's events plus athlete interviews and prognostication on the likely outcome of upcoming events. The stories are quite in depth for a mobile site. Not surprisingly, coverage emphasizes US athletes.
The site works best on smartphones. It looks great and is easy to navigate on my Android phone, Nokia N95 and using Opera Mini. NBC and their mobile design partner, Starcut Media, made some effort at adapting content to a variety of handsets by varying image and video size and quality but the homepage weighs in at 64 KB, too large for the embedded browsers of many feature phones.
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