Which IT Certifications for Specific IT Jobs?

outlander78 asks: "There have been several questions posted recently (Landing a job, College or Career? to list a few) discussing education and job searching. I have just completed a BSc Computer Science, and have 2 years of co-op experience. This is apparently not enough, as I have yet to get a single interview, despite many carefully written letters and resume submissions to job postings. I read here that a degree with certifications was a good combination, so now I need to know - which certifications are best for job seekers? Whether I work as programmer, sys admin or something else isn't an issue, since I need any job at this point, and enjoy most computer-related jobs - please, suggest whatever certifications you are hiring for or were hired because of."