JDK 7 Milestone 3 has been released! Build 59 was the sixth and final build for Milestone 3.
Along with code changes that went into Milestone 3 which are summarized here: http://download.java.net/jdk7/changes/jdk7-b59.html, Milestone 3 included changes to the JDK 7 documentation, which had been on hiatus for several builds. The changes to the docs can be found here: http://download.java.net/jdk7/docs/.
Development for Milestone 4 continues and we expect for it to complete towards the end of July.
The source for b59 can be downloaded any time, from the Mercurial Repositories by doing the following:
hg fclone -r jdk7-b59 http://hg.openjdk.java.net/jdk7/jdk7 myjdk7