Firstly, try not to get your panties in a bunch, they’ll chafe and make you look silly.
As I mentioned in the original commit log (which wasn’t fully reproduced in the parent post) these things are at various levels of WIP-ness. I’ve been working on this stuff on and off for a while now, and thought it was about time it was in SVN somewhere rather than just on my hard disk. Most things like egan pointed out, I’m aware of. Some things like the radial menus are in there because I like using them, but also as a temporary prelude to be developed further after the events refactor etc, which should make things much easier.
About the radial menus:
There is a user preference in View & Controls.
You’ve all picked the nice worst case scenario edit mode W menu to complain about and I’m well aware that it doesn’t work well for menus like that. The main problem there though is the menu itself - it’s got to be the worst menu in Blender, a poorly organised grab-bag full of vaguely related tools, with some more useless than others, that is too long to even use the 1-9 hotkeys for. Other menus are just as bad (knife tool in both K and Ctrl E? Loop Cut in K, Ctrl E, and with it’s own hotkey?) This sort of thing really should be cleaned up to be more sensible and ergonomic - again, waiting on events work.
But for more ‘normal’ sized menus (manipulator type, v/e/f select, snap, merge, delete, etc.), the radial menus work a treat. If you haven’t already seen it, read this and watch the videos. The thing is, it will feel weird and slow at first, since the speed comes from building up muscle memory (which shouldn’t take too long, at least from my own experience). The other thing too with the menus is that ideally after the events work, my aim is to have it fully customisable, so you can define in detail, which menus you want to be flat, or which you want to be radial. So you could even conceivably have all flat menus, with extra user-defined radial ones.
About the colours, I think the darkness is from some bug in the old .B.blend conversion, I’ll check it eventually. But it should look fine if you do file->load factory settings.
Egan, about the sliders: I haven’t even touched any of the other themes yet, I’ve just been concerned with the round shaded theme. The others should eventually be brought up to using the new slider design, yes. The new sliders are a lot more space efficient, and will allow for much better panel layouts. Currently in Blender 2.4x, using sliders means a tradeoff between either numeric precision or wasting space, which these new ones solve. There’s also a nice new shortcut, you can Alt-click a slider to set the value directly to the position that you clicked on, though maybe this should be Ctrl, since it conflicts with emulate 3 button mouse.
About button layout, this has some background, though it’s a bit out of date: http://wiki.blender.org/index.php/BlenderDev/ButtonsInformationArchitecture