The current 'standard' release of Eclipse (indigo) comes with m2eclipse installed. However, as of m2e v1.0, "interesting lifecycle phases" are now handled via a 'connector'. However, several of the plugins we use don't support connectors. This means that eclipse bails out and won't build the project or view it as 'working' even though it builds just fine from the the command line.
Since Eclipse is one of the major java IDEs and that Indigo has been around for a while, we should make it easy to for new devs to pick up the code and for older devs to upgrade painlessly. The original build should not be modified in any significant way.