Provide a key for what the lines on the graph mean.
There is a red line and a grey line and it is not clear what they denote.
Admindreeves (Cofounder, Beeminder) commented
Ah, those are described here for now -- http://beeminder.com/about -- but we're working on revamping that and having a key on the graph page itself is a great idea.
(Note that what looks like a thin gray line is actually a purple line.)