This interesting tid bit comes courtesy of Ralph Grabowski's upFront.eZine newsletter. You can have a new hobby by checking out how many H1B visas are hosted by companies that interest you.
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Clemson University records the number of H1B visa-holders in the USA. H1B allows US companies to employ foreign workers for 3 or 6 years in occupations that require a minimum of a bachelor's degree. (Canadians can work in the USA under similar conditions through the TC1 visa program.)
For the CAD companies I checked, the number of H1B employees in 2007 were:
Company No. Average salary
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Autodesk 75 $76,690
Bentley 31 $68,189
IronCAD 2 $66,500
Nemetschek NA 2 $74,646
PTC 106 $77,411
SolidWorks 14 $81,956
UGS Corp 74 $77,851