Some nice ideas there (per-developer view, tags).
A few issues (mostly in comparison to lkml.org):
There is a lot of wasted vertical space with the summary message display ("Home","Messages"):
seems too much (and who cares about the exact time and date really?). Personally I'd go with
<author> <date> <subject> or so.
Individual message display: black text on grey background not so good.
"Message" page: I find the per-day statistics on top not that important or interesting. Could be moved to some "Statistics" page? There should be space for like 100 messages without too much scrolling.
Will it be more reliable than lkml.org? That would be really cool.