Responsive design to be mobile friendly.
Currently if I am on a smaller form factor device such as my phone. I either have to zoom to see anything and drag around, or if my OS happens to have an app for it I can download it. Two problems with this. First is new mobile platforms are unsupported (I work on the Firefox OS project) the second is that the barrier to entry for using the site is a lot higher on mobile, I have to go find your app in the app store then download it, then I can start doing things.

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Jonny commented
Yeah, beeminder on the mobile browser is a pain.
Provided the target devices understand media queries (many do), they look like the cheapest way to make beeminder more easily to view. http://www.vcarrer.com/2010/07/bulletproof-css3-media-queries.html -
Wraithan McDonald commented
I'll opt out as I am not wholly bought into the site. Just noticed while I was waiting for my food at a restaurant that I couldn't easily check the site.
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Admindreeves (Cofounder, Beeminder) commented
Well said! Agreed and upvoted, though of course this is easier said than done, at least in the short term.
(We hugely appreciate this kind of technical feedback and if you'd like we'd be delighted to add you as a member of our trello boards. They should be publicly readable at trello.com/beeminder )