Personally I don't think the pay services out there offer all that much, with the exception of Climbto350.com... (I am biased though since I landed my current job through that site).
Here's a few that I looked through when I was searching...
http://www.airportbusiness.com/directory/?cat=167
http://aviationemploymentboard.net/forum
http://www.jet-professionals.com/index.html
http://www.nationjob.com/aviation/jobs
http://www.corporatepilot.com
http://www.findapilot.com
http://www.flitejobs.com/aviation_jobs_board/pilot_jobs.php
http://www.turnergroupsrvs.com/job_listings.asp
http://www.jsfirm.com/?OVRAW=pilot%20jobs&OVKEY=pilot%20jobs&OVMTC=standard
http://studentservices.aero.und.edu/f4_Jobs%20and%20Scholarships/index.php
Here's a few that I looked through when I was searching...
http://www.airportbusiness.com/directory/?cat=167
http://aviationemploymentboard.net/forum
http://www.jet-professionals.com/index.html
http://www.nationjob.com/aviation/jobs
http://www.corporatepilot.com
http://www.findapilot.com
http://www.flitejobs.com/aviation_jobs_board/pilot_jobs.php
http://www.turnergroupsrvs.com/job_listings.asp
http://www.jsfirm.com/?OVRAW=pilot%20jobs&OVKEY=pilot%20jobs&OVMTC=standard
http://studentservices.aero.und.edu/f4_Jobs%20and%20Scholarships/index.php