Apparently the tinymail threads are crashing for some reason or another, it's being worked on and some of the fixes should have made it into the svn. johnx compiled it yesterday, and I'm certain he'd be willing to share a binary if you asked.
I personally don't have a lot of problems with volume and VoIP, but, yeah, the volume as a whole for the entire platform is a little low for what the hardware is capable of.
This one has been covered a lot already. But I'll explain it again here. Major code changes are frozen 2-3 months before the release...
Yes, that's why the AGPS support is beta, and doesn't ship with Diablo. . . .
Is that top consumption? Because top consumption is entirely meaningless. Install htop and get back to me on that one.
. . . and yet, I've found Diablo to be a net positive overall. Application manager is much more usable, overall system stability is improved here, virtual input methods are much more consistent system-wide, and much of the phantom typing in the fkb and vkb seems to have been eliminated.
The thing to keep in mind for Diablo, though, is SSU. The good news is that a lot of the issues seem to be getting fixed internally, and all that's needed is a couple of SSU pushes to get them to us (well, or you can try out the svns for the open stuff if that's your thing)—no waiting 4 months for another big firmware release.