Health insurance. What's your co-pay? Do they cover dental? Ocular? What about chiropractic? Psychiatic? Substance abuse? Are family members covered? What about your non-married significant other?
Can you tele-commute? If so, will they supply you with a laptop? Will they pay for broadband?
What's the review process at your job? Are you going to have a performance review every 6 months? Every year? How does that relate to raises/bonuses?
Are stock options available to you? What about an employee stock purchase plan? What about the 401K? Does the employer match employee contributions?
A healthy employee is a happy employee, and one who doesn't make a lot of insurance claims. Does the company have an on-site gym? Will they pay for a gym membership? What about a discount?
Training. A friend of mine had a deal worked out with a former employer. When he took classes, reimbursement was contingent on his grade. If he got an A, they paid 100% of tuition and fees. For a B, they paid 90%. For a C or lower, zip. It really encouraged him to buckle down, and he got the A.
Finally, let me relay some advice. If you hate the job, there's no amount of money that will make it worthwhile. When I quit Microsoft, I took a 50% cut in compensation in exchange for peace of mind. It was worth every penny. My stomach stopped hurting, I stopped throwing up every morning, and I was able to enjoy life. If you're just doing it for the money, you're garanteed to be miserable.
"What do I want? I'm an American. I want more."
I never realized the value of it til last fall when I had my two front teeth shattered playing ice hockey. Dental insurance covered the whole thing (apart from an unneceessary trip to the emergency room).