First of all, thanks for the review, it pretty much outlines the issues I feel uneasy about as well. First, most of these issues are caused by SVG icon being scaled down (sometimes for a reason unknown to me and sometimes because of missing appropriate size variant). So I skip these, because we need to just finish other size and adjust them a little to keep them in sync with other icons. I seriously doubt we'll fix those in time for F10.
Now, for the rest.
The delete icon - yes, it looks different and I proposed we change it to something other. The discussion was postponed for after F10 release.
The close icon on tabs - yes, it is chopped off and I don't understand why. It has correct size and the icon itself isn't chopped off, but in *some* applications it looks this way :-/
The door icon - the doors are slightly opened, perhaps too little, and behind there is a black space. The two pixel width outline is because both door and the door-hole has it's own outline. I agree, it might need improvement.
System->Administration - yep, it probably needs rework to better fit with the style.
Shut Down - dunno if you remember, but at the time it was being created there were a lot of submission and for some reason we chose this on. But even after a half a year (IIRC) of seeing it everyday it looks a bit weird me.
Network - yep, an old style one. We need to use the new styled monitors for these...
Palm - agreed
Volume - I accepted it back when we were creating it, but it seems to me it actually uses different perspective from other icons...
Firefox, Thunderbird, OpenOffice = pain, while firefox being the best... Basically the toolbar icons are pretty much themable in firefox, thunderbird needs theme, openoffice needs theme. Not a decent citizens. Seeing that our mail client of choice is Evolution though, which works good with Echo, I'd guess Thuderbird hasn't the highest priority (and it does not even fit with the F9 default icon theme). For openoffice we would probably need to symlink/copy the echo icons into echo icon theme for openoffice... I don't know, how they handle it.
I'd very much like to hear Luya's opinion, but I don't feel like supporting Echo for F10 as default much longer...
Martin