The change in fonts works great for the normal interface, thanks for the tip! I'm still struggling with the body text for plain-text mails though... It looks like it's using courier no matter what I put in for the "FontFamily-fixed" entry. Unfortunately, with the default clear-type in WinXP, it's fairly skinny and faded. I suppose it's always been that way, but I'm mostly in Win7 / Linux & hadn't noticed it. Anybody have any luck changing the fixed font to something like "Lucida Console" or similar? Or, barring that, just changing the weight to bold?
Update: You can change the weight by specifying it after the font family: Helvitica; font-weight:bold; or so.... Also, the fixed font changes were populating, but required a cache flush by the browser to see it. Doh!