I wear a titanium wedding band and I love it. They're comfortable, not real expensive, weigh about the same as aluminum, and are really tough. On the other hand, you'll never win a "bling" competition with one.

Make sure to get the right size! I was told when I bought it that you can't get it resized at a normal jeweler because the metal has be heated much hotter more than gold or silver and they don't have the equipment to do it.

According to wikipedia "It is a light, strong, lustrous, corrosion-resistant (including resistance to sea water and chlorine) metal....The two most useful properties of the metal form are corrosion resistance, and the highest strength-to-weight ratio of any metal. In its unalloyed condition, titanium is as strong as steel, but 45% lighter."