What do you want to see next?

[pmeenan]

There's a documented automation API available now (essentially what the form was doing anyway): http://www.webpagetest.org/docs/Automating_Pagetest

Beacon support isn't there right now but it shouldn't be hard to add. Was going to look at supporting having it send up HAR files and raw results so that falls right in line with what you are talking about.

Also on the list to consider is a way for doing recurring tests (at a minimum for the private installs but maybe a fixed set of pages on the public site as well) which combined with ShowSlow would give you interesting trending reporting. I'll ping you offline because I'm working with someone on possibly standardizing the various interactions which would allow for even more creative mashups.