If you search for job boards using "skilled or hourly" keywords, your search will not reveal as much as if you visit top boards and use the keywords on each board separately.
Here is a list to check out today!
Google Base - Select Jobs, Enter Keyword "Skilled" and your zip code.
GoJobs.com - Browse Jobs by State,and then enter keyword "Skilled". If you select the job categories in the left menu, you will get jobs at all levels, not focused by education or skill levels.
Indeed.com - Super simple interface. Search by Job Title and zip code. For example enter "HVAC" and your zip code, to yield the latest and closest job openings.
JuJu.com - Super simple interface. Select job category and zip code to get the quickest list.
Oodle.com - Oodle remembers your last search and will bring you back there. Oodle.com is not just about jobs, but about finding "oodles" of stuff through classified ads. Easy interface.
Remember that these job boards are often in partnerships with each other and you might very well find the same positions on all of them.
Just identify a layout you like and stick with one to three. Anymore than that and it can get out of hand.