I was really worried about my undergrad academics as well - 3.16 cumulative GPA / 2.7 major GPA (BA Integrative Biology) and did not have a letter of rec from an academic source.
Was I sure surprised when I heard back from my first choice school (UW Evans) - an acceptance with a good amount of funding!
I did do reasonably well on the GRE - 161 V, 162 Q, 4.5 W and had gained some experience with student organizations while in undergrad and am currently in AmeriCorps (I applied with not even a year of full time work experience). I'm SURE your work experience will add a lot to your application.
Hopefully this makes you feel better about your chances to not only get in, but get funding