Nice timing on the thread...I'm studying for the GMAT myself since I'm between jobs right now. While management experience is commendable, the majority of 23 to 25 year-olds applying don't have any real 'management' experience. In this case, schools are looking carefully at the type of job you've held. Consulting and finance jobs look very good because they teach you about the internals of a company...what makes one tick so to speak. Also, it doesn't hurt that most of the top firms in these fields have gobs of money that they throw into their training programs, making them some of the best and most desirable entry-level jobs (though 80-100 hour work weeks can be quite demanding!)
Next on the scale are the sales and marketing jobs. Here you are likely to get some management experience...managing clients for instance. Cultivating leads, understanding your customers, identifying new markets, and above all, generating sales--these are the skills (or achievements really) that schools want to see on your resume.
I myself have been in consulting for the past 3 years, except I got stuck working for a tiny niche startup that really didn't give me the exposure or the industry experience I was looking for. Eventually I would like to get into marketing high-tech products (either B2B or B2C) so I'm looking for a basic entry-level marketing job that I can use as a segway into an MBA with a marketing concentration.