Hi Scott,
If you are using C#, the best way is to use the .NET Controls (WaveformGraph, ScatterGraph, etc. in the Measurement Studio section of the toolbox). Edit the XAxes, and choose LogBase 10 with a Logarithmic ScaleType. If you don't like the MinorDivisions, you can set their TickVisible property to False.
Cheers,
David Goldberg
National Instruments
Software R&D