You just made my day. I pushed my first snapshot to heroku last night after working furiously to meet the self-imposed "working prototype by Friday morning" milestone I had for myself. At 2am I pushed up to Heroku and my working local prototype never came close to loading. I went to sleep wondering what I and messed up so horribly that the first page couldn't even render on the Heroku servers. All is not lost!
Please check http://status.heroku.com/ for details - we've seen two issues this morning, so updates will be posted there (and to @herokustatus)
Yes, a friend of mine is having trouble too. Not every app seems down though.