I've been using Halo headbands that have a rubber strip to try to guide sweat away from your eyes. When cycling, the sweat pools in the front, however, and drips right down the middle of my face. (Works much better for jogging, etc.)
I've tried lots of other solutions, but have not found a perfect one. It's a real drag to have to take off my cycling goggles to wipe my face. Also, it's dangerous when the sweat actually gets into my eyes. I can't see!