I've been trying the new compose page in Gmail. It's one of those "what took you so long?" ideas. Many times I have opened Gmail again in a second tab when composing to get information while composing.
It is missing a few things like CC and BCC that made me go back to the previous version to finish my message, but overall I think it is a step in the right direction.
What do you think? Have you tried the new compose page in Gmail?