It is ! [ alt text ] (url)
So 
I wasn't sure how the drop shadow would interact with the low contrast sections. I can easily imagine it is not ideal.
You've removed the tag-line. I'm not sure if that is acceptable to the powers that control lesswrong. But apart from that it seems like a good logo. Actually from a user experience point of view it might be worth redoing the map background (using different map sections) as well so it is easier to tell at a glance which section we are on. Perhaps even changing the colour scheme?
I can give that a go, if it will get used?
ETA: Thinking about it, simply changing the grey of the bars at either side of the page to something a bit lighter would be a sufficient change to let me know where I was, and how serious the discussion should be.
The wiki uses a different map background, so that suggestion is more or less guaranteed to be acceptable to the powers that be. And that could definitely solve the readability problem (like I said though, still seems awkwardly wide to me).
As for the tag line, it's changed up a bit on the wiki, so I figured it was at least not set in stone. The reason I figured we could lose it is that it only sort-of applies to this area of the site. A more appropriate one might be "a staging area sandbox for ideas about human rationality"... Of course I'm not suggesting we actually put that there, just emphasizing that it's applicability falls off a bit.
Thanks for the syntax help, updating original post!
After contributions from a number of us (by random example here, here) over a number of months, particularly User:wmoore and User:tommccabe (and all happening before User:Yvain's work here, so we missed those ideas) we have a discussion area.
Discussion, including discussion of the discussion area, is welcome.