Me too. I saw that article. I had been using jekyll for a while. Then I decided to piece together how to replicate what the obama campaign did using s3 and cloudfront: http://iamnotaprogrammer.com/Jekyll-S3-Cloudfront-Aname-Root...
As far as cost. I'm 30 and I don't like relying on free things. Github probably wont go down, but I'd still rather pay. I set that up Dec 1st, served 100k pageviews. My Amazon bill right now is $1.25 (one dollar, twenty five cents). Maybe that'll go up, but for what I'm doing, I doubt it will be that expensive.