I know how you feel. The company I work for was looking for a webmaster to work with us PHP coders so they didn't NEED to know PHP but it is a plus. The add also says strong HTML skills, NO WYSIWYGs yet every resume has Microsoft this and Microsoft that and Frontpage and dreamweaver, etc.
some just give examples of Flash, but that tells us nothing about their HTML skills.
Other than Monster, you should also try techies.com and dice.com
computerwork.com
net-temps.com
(all sites where I was registered while looking for work).
do google searches for PHP guru, etc.
Those job sites are both a blessing and a curse for both job-seekers and employers. The job seeker could be perfect for the job, but because 1,000 other people applied, they get lost in the sea of candidates.
For the employer, you may find the perfect person for the job, but only after reading through thousands of resumes that don't even have the qualifications you are looking for.
As a PHP/MySQL/Perl programmer, it was hard for me to find work for the same reasons. 99% of the employers were looking for Microsoft technologies.