@Daniel Payne: Synopsys is indeed #1 in EDA but a new/old player is in the block now -ANSYS! Thru Ansoft & Apache acquisition, ANSYS is the most diversified EDA companies, followed by Mentor as a close second in diversification.
I believe the time is right for Synopsys / Mentor (& Cadence?) to match ANSYS in diversification. Mentor has many capabilities that ANSYS does in thermal and fluid flow. It is missing a few solutions to match ANSYS and I believe Mentor is in a good position to make some strategic acquisitions!
Synopsys is still the number one EDA vendor. See www.edac.org for quarterly revenue numbers.
Brion was acquired by ASML and is narrowly focused on lithography tools.
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I believe that a year ago, Gary Smith had Mentor and Cadence trading off 2nd and 3rd place, depending on whether you count services (advantage Cadence) or not (advantage Mentor).
I think that I got the order right ...