I usually take a multivitamin (not 100%, because I often drink a soy energy drink that is vitamin and mineral enriched), omega 3 (OmegaZen, a non-fish version), glucosamine (a vegan version), and alpha-lipoic acid (an antioxidant, which also contains vitamin C and E). In the p.m., I take calcium and vitamin D.
Be careful about overdoing some supplements. If you eat a breakfast cereal like Total, and/or have a vitamin/mineral enriched bar or shake and take a multivitamin, you could be getting dangerous levels of some nutrients. Vitamin A is one to watch for. Though betacarotene (or pro-vitamin A, a precursor to vitamin A that is converted by your body into vitamin A as needed) is safe, too much of other vitamin A (ie: vitamin A palmitate) can be dangerous.
Also, be sure you need an iron supplement before deciding to take one. Many nutritionists recommend against iron supplements unless necessary, and post-menopausal women should be especially careful. Too much iron can contribute to cardiovascular problems. If you are premenopausal, you might consider taking iron at TTOM only, if at all.