I apologize for the vagueness ahead of time, but as a web guy I remember testing some DHTML/CSS stuff back in the spring, when Safari was still "beta", and noted some incompatibilities. Here's the vague part, I don't remember what was causing the problems.

I have no idea what the Perl Monk's CSS looks like, but here's a relatively recent chart of CSS compatibility, for what it's worth. Also some helpful links there.

Gotta love them browser standards!