I would add as a couple of other tips:
1. Provide a contact email, esp. for larger companies, filling out a n page submission form is a killer.
2. Use LinkedIn and the other boards not headhunters, Dice and Monster feel like headhunter spam. At least with LinkedIn you can connect from a posting, to a company to an HR person.
Personally I would love it if Dice had a filter headhunter option, but it probably would kill their #1 revenue stream.