It depends on the job you are looking for and where you went to school.
There are so many private colleges popping up everywhere promising that you will graduate quicker and be job-ready earlier, but the reality is that most companies will only hire people from accredited colleges and universities that have been around for years. Some private colleges have better reputations, but even the one I went to, which was a large chain, disappeared after 10 years.
A lot of employers hire based on what you know and who you know. Review your references to ensure that you have all the right people who can really speak to your experience. You may even want to use different references for each different job you apply for. Don't burn any bridges--keep in touch with your old employers and co-workers often without making a nuisance of yourself. You never know who might be a secretary one day and CEO of an organization the next day.
Research all the companies before your interviews so you can improve your cover letters, give intelligent responses to their questions, and ask informed questions during the interview. Also, find out what jobs are available in the company to get your foot in the door; there is no shame in working on the cleaning staff for a while until the right job becomes available, and you could learn about potential job opportunities before they are advertised.
Prepping for the job interview also goes a long way toward ensuring that you will be able to exude confidence when they ask you scenario-type questions. Most colleges, even the private ones, offer employment assistance, including evaluation of your resume and video-taped mock interviews with feedback and unlimited follow-up. You have to be able to make yourself stand out from everyone else because there are literally thousands of people out there who are all looking for the same type of work. Apply for anything and everything, and even go to interviews for the jobs you don't think you want, because you will learn something more with each interviewing experience.
What type of resume are you using? If you are still using the standard "chronological" resume, you may like to switch to the "functional" resume so that your qualifications are the first thing they see http://www.odlc.utoronto.ca/docs/generalfuncresume2.pdf
I found it hard to get used to the layout of this style of resume at first, but I got more interviews and job offers once I changed the format. I never thought it would have been that simple. Also, you should have more than one resume, and gear each resume and cover letter to the specific jobs you are applying for. And, there are key words that employers look for; they may even use scanning software to skim resumes for these words and eliminate the ones that don't use them. Use words that appear in the advertisements and job descriptions and choose some from these lists http://www2.ferrum.edu/career/guide/keywords.htm
A two-page resume is acceptable, but it should never be longer than that unless you are applying for a job as CEO and have a lot of supporting experience.
As for volunteering, it depends on what you do in your volunteer job. Some volunteer positions provide a lot of experience whereas others have a lot of downtime. If you use your downtime wisely and can get really good references who will attest to your dedication to the work, then that makes a big difference. Even so, there are still a lot of single-minded employers out there who don't view volunteer work as "real work" even though some volunteers work harder and put in more hours than the regular staff.
And finally, don't assume that you are finished with your education. Learning should be a lifelong experience, and employers like to see people who further their education by attending courses, workshops and seminars. Check out your local community colleges' continuing education catalogues. Attend lectures and workshops that are offered in the community by the chamber of commerce and other professional groups. Look up the companies you have applied to work for and see if they offer educational opportunities that are open to the public.