I'm having some trouble reading this site (as my eyes are not that young anymore). It's the color of the fonts. Those soft-toned pastel colors make certain pages hard to read, for me at least (and maybe some others too).
Here's a list of pages I'd like to see improved : Overview, Downloads, Source, Changesets (and sub-pages). Issues is ok, except if an issue contains code paste in it. Then the code-coloring is too soft too. (There may be others I haven't discovered yet.)
So my request may not be top priority concerning functionality, but some means to choose more contrasting colors would be very welcome.