I personally would love to see better integration with JetBrains' IntelliJ IDEA. There is a bzr plugin for it already, but it's not maintained and currently crashes on most VCS operations in IDEA 11.<div><br></div>
<div>The community edition of IDEA is open source: <a href="http://www.jetbrains.org/display/IJOS/Home">http://www.jetbrains.org/display/IJOS/Home</a></div>