JBossWeb - the JBoss Web Container - is-implemented-by/is-a-rebranding-of Jetty.
If WEB/JBoss==JBossWeb then YES.
Jetty is now an integral part of JBoss3 - a part of the codebase. Tomcat is a 3rd party project which may be integrated, but over the codebase and direction of which JBoss developers have no influence (unless Remi - freshly joined - does?).
Yes, JBoss.org runs on Jetty - and "pops icecubes down the vest of a SlashDotting".
Why are we running Windows - no idea....