Eclipse 3.4, "Ganymede" is finally here. Check out the very lengthy New and Noteworthy.
One of the big new features is real-time shared editing via Cola.
Cola: Real-Time Shared Editing from Mustafa K. Isik on Vimeo.
One minor frustration is that the PHP Development Tools (PDT) did not participate. Ganymede users will need to upgrade to a beta version of PDT 1.1, not due to be released until September. If you do plan to try the beta, there are installation instructions on the wiki.
Eclipse is great IDE for developing java search technology, Lucene, Minion, Solr, Nutch, and others.