Try to find a recruiter who specializes in your technical field and geographical preference. Find a recruiter that you like to work with and that you trust. Most recruiters are true professionals with very high ethics. Provide your recruiter with your current salary information and expectations. Do n't put important facts in the cover letter you send to your recruiter.
Cover letters tend to get lost in the shuffle.
Keep your cover letter short and specific. Make it easy for your recruiter to get and read your resume. Don't assume that your recruiter has every possible technology in place to receive and read your resume. Website resumes look great, but they are hard to read offline. R ecruiters are usually NOT good vehicles to help you change careers.