I read the interesting book Web Usability 2.0 from Jakob Nielsen and Hoa Loranger, and I found an advice about fonts in web writing that really matched my tastes and ideas about the topic:
- Georgia: the best serif font, it is the perfect replacement for the (now archaic) Times New Roman;
- Trebuchet MS: a very nice sans serif font;
- Verdana: perfect for any web site that should have professional appearance, it is the most readable (this site uses also Verdana);
- Courier New: monospaced, perfect for posting programming code.