How is it we can know the weight of a person's soul* but not be able to measure the success of a piece of individual FOSS software with the truly compelling metrics needed to satisfy and influence enterprise adopters and governments.

A recent report (26th August 2009) by IDC indicates that worldwide revenue from Linux operating systems software grew by 23.4% from 2007 to 2008 and by projecting a 16.9% CAGR (compound annual growth rate) over the period 2008-13 the market size will cross $1 billion for the first time in 2012, growing to $1.2 billion by 2013 (www.idc.com).

Whilst this is a useful figure it doesn't enable us to generate a market share figure for an individual application.

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