My complaint about all of these mail-systems is that I want Upper Left Corner user controls - sign-in's, log-outs, etc. I want those controls to always be most visible, most often, and that's upper left corner - not far upper right corner, which can require scroll-overs.
I'm unsure if new traffic indicates "approval of change" or the equally-likely "I have to see this, shake my head twice and re-login to make sure I'm REALLY seeing this" mode.
This format appears similar to other mail-systems, though, as if that's any consolation (it's not!) but it does make switching to others perhaps more palatable? It's hard for me to consider this, but I really can see the day when Yahoo has been sold off, parceled out and shut down. The Novell of the World Wide Web. Who'da thunk it?