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!
Now you've made me notice that the wiki logo doesn't have a drop shadow on the ": wiki".
Hmm, I'm not sure what should be done. The wiki logo has ": wiki" and a tag line, so the current ":discussion" logo is just an continuation of that theme. Width is an issue, but I like the current consistency.
I'm going to hold off making any more variants of any logos until we have a way of picking between them.
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.