Just a quick note: Antoine updated the diff view styles in trunk to use the green/blue scheme that's been in use on fr.wikipedia.org and others for some time:
https://www.mediawiki.org/wiki/Special:Code/MediaWiki/105280
This should be a bit more consistent than the scheme we were using in 1.18, and is specifically designed to be legible to people with various types of color blindness as well as the general population.
-- brion