{Updated: 01/17/2015}
There is a lot of interest in getting certified as SolidWorks Expert (CSWE). Through there are no official accolades that go long with passing the CSWE, the certificate can garner industry recognition of your established skills. Even as the number of Certified SolidWorks Professional grows (CSWP) due to the online accessibility, the number of those with the higher CSWE certification is still small by comparison. Right now, there’s just over 1000 CSWEs {update: still under 2000, as of Jan 2015}. Please see this Certified SolidWorks Professional infographic for additional details.
To earn the opportunity to take the CSWE exam, you have to pass the CSWP and also pass three four advanced exam modules from the selection of topics: Weldments, FEA, etc. Surfacing, Sheet Metal, Drawing Tools and Mold Tools. {FEA is no longer included as a option to fulfill the CSWE prerequisites.}
Applian Way Technologies has a blog with several articles that are brief preparation guides for various exam modules. A Very Swell Idea, Inc has some good advice for taking the modules in their discussion of CSWP Weldment exam. 3D Dimensional Engineer also has a great series on CSWP Preparation.
SolidWorks website itself has great information for each exam, including the core and the expert exams.