May I suggest we use a non-serif font for the headers (sans-serif or Arial or Verdana or whatever).
Serif has been invented to facilitate the reader in following a line of text without hopping from one line to another inadvertently.
It is a compromise at best on monitors because it really needs a fine resolution for all nifty details. Non-serif fonts generally give a less crowded appearance. Since the 'skipping a line' arguments does not hold for headers one often sees a combination of body text in serif, headers in sans-serif.
Of course it is also a matter of taste and what one is used to. Speaking of taste: sans-serif tends to be seen as slightly more modern. I bet the Times will be the last to abandon Times Roman, even for headers. :-)
Erik Zachte