Serious Eats - seriouseats.com

I personally think that a good serrated knife, particularly a tomato knife like this one featured on amazon http://tinyurl.com/mgteoy work great for hard cheeses.

I like to use the one-handed test - if you can't cut and dispense the cheese onto your handy cracker, you don't have the correct tool.

I agree with "jumpyfroggy" on the wire slicer ! I had an adjustable wire slicer years ago it was the greatest thing since sliced bread and the wire snapped after years of faithful use, but my ex threw it out before I could repair it [an easy fix] so I got a divorce.
I have not been able to find another adjustable wire slicer since but I found my new wife of twenty years . If anyone comes across one please post it on SE.
With all other cheeses I use various blade widths of the knives depending upon the cheese, but I'll use my wire if I can gives me consistent 1/4" slices . I use my peeler for a cheese shaver, another multi-tasker.