I just installed a local copy of the W3C HTML Validator tool on my laptop, thanks to the instructions provided by Apple. That was one heck of a process. Time in CVS checking stuff out, time in CPAN, time compiling stuff, finking stuff. All told, it took about an hour and a half (partially due to my slow internet connection at home at the moment).
Really appreciating the checkbox simplicity of the stuff that ships with MacOSX ;-) - I wonder if they'll ship the validator on Tiger Server?