Nike is celebrating 5 years of Nike+, their iPhone/iPod Touch app to track your running. I've used it for the full five years and I really enjoy it. While I'm not a hardcore runner, Nike+ has motivated me to go from never running, to now going a few times a week (my favourite style is trail running).
Join the celebration on their Facebook page and then enter the contest (Hooray, it is open to Canadians!) as five lucky winners will receive two bib numbers to run in either the Bank of America Chicago Marathon or the Nike Women’s Marathon in San Francisco.