We've been experiencing some hiccups with the server lately. In short, the site is getting too busy for it's own good and it's bringing the server to a crawl. Sorry for the slowness and occasional downtime. We're actually looking into upgrading the server so that everyone can get their themes quickly and easily again. Just to give everyone an idea of how busy we are, we did over 1.5Tb (yes, 1,584 gigabytes) of data last month. That's just crazy. We never expected things to be this busy.
So hang in there, server upgrades are on their way!
psst.. early mornings and late nights are the best time to get themes, while everyone else is sleeping. :)