BZ Research Study Names JBoss #1: "JBoss is the leader in J2EE application server usage according to BZ Research. Not only is JBoss the standard in open source Middleware; the industry has now made JBoss the overall leader in Middleware -- ahead of IBM, BEA, Oracle and others. How do we do it? By delivering enterprise-proven open source technology and backing it up with expert technical support directly from the source."
Interesting milestone. I haven't yet read the full report, but I don't doubt that JBoss has very strong momentum. Check the page for a free download of the market analysis.
(Or maybe not -- the report download app seems to be broken...)