I haven't tried any mattifying lotions that worked well for me, but I found another product that does the trick that I'm hooked on... Benefit's Dr. Feel Good (available at department stores or Sephora).

It's meant as a face primer, but I didn't really notice much of a difference when used this way. Instead, I apply it around noon or so when my face gets a little bit of shine on my forehead. It's a balm in a little tin.. I just apply a little bit and it soaks up any shine and keeps a matte finish for the rest of the day! It also has helped prevent breakouts since it absorbs the oil. The tin lasts a long time as well. Other than that, I like Clean & Clear's oil absorbing sheets. I used to use these when my skin was very oily as a teen.