Font vs. typeface—they’re not the same. Here’s an article that explains why.
Is It a Font or a Typeface?.

I’ve been reading up on the developing CSS3 spec and was intrigued when I found the re-introduction of the ‘font-size-adjust’ property. I love the idea of maximizing legibility in font substitutions.
The biggest problem I found was, how is someone supposed to find the font aspect ratio? The key is finding the x-height. Here’s a tool [...]

Periodically, I like to revise my list of web safe fonts. I know that these lists exist all over the internet, but I like to keep my own records to reflect my own expectations.
These results check against operating system font installations for Mac OS X 10.3+ and Windows XP.
The web safe fonts are:

Arial
Arial Black
Comic [...]