You can do a conditioner wash every night like Crystena77 said. I don't do them as often, but I do like to do them on random days when my hair doesn't need to be "shampooed", but I want to rinse it and freshen it up or my ends look like they could use some conditioning. It definitely keeps your hair soft and moisturized, but your hair also feels clean. I think I do them more during the winter than in the summer, because of they dryness of weather. They're like mini-deep conditions.
You can use any conditioner that you like. I actually did one last night with some leftover Biosilk Conditioner, since I needed to finish the bottle. Lekair Cholesterol might be a good one since you can buy it in large sizes and it's not that expensive. Pantene smooth and Sleek, Clairol 5x Renewal, and Motions Moisture Plus are good also.They also give a lot of slip(detangling help)when you rinse. Basically you're looking for conditioners that give you moisture boosts. I know there was a thread where everyone listed some of their favorites, so it might help to look for that one.
After I finish I also air dry my hair in a bun or french braid.