The three guys that I endorse for frequent flyer mileage redemption are (I do know all of them and have met them in person more than once) - I believe their fees for the service are very similar:

Ben - as indicated above - his blog is at http://boardingarea.com/blogs/onemileatatime/ - personally he usually flies United & American but does very creative redemptions - I'm very good friends with him.

Gary Leff - his blog is at http://boardingarea.com/blogs/viewfromthewing/ - I believe he usually flies United and is very good with Star Alliance redemptions.

Brian Kelly - his blog is at http://thepointsguy.com/ - he usually flies Delta and is very good with SkyTeam redemptions.