With 102 issues closed since RC1, Mule 2.0 is becoming more stable than ever with its second Release Candidate.
This release includes for the first time the Mule CXF Transport which is an evolution of Mule's XFire Transport for web service integration via Apache CXF.
If you still haven't seen Mule 2.0, take a look at Whats New in Mule 2.0 and the Mule 2.0 Configuration Guide to get you started.
One more thing worth mentioning is that we have been continuously merging in fixes from 1.x, so any issue resolved for 1.4.4 should also be resolved in 2.0