It seems like Github has been going down a lot lately. Is there a particular reason that is the source of their troubles? What about Github's architecture might make it more vulnerable to downtime than other sites and services?
I don't think they actually have a higher failure rate than other large scale web applications. They are just very open about their failures and data. <a href="http://status.github.com/" rel="nofollow">http://status.github.com/</a> reports an uptime of 99.8% for the month. Not _fantastic_ but very very good.