Many people have a beef with the JCP. Javaworld did a fact based analysis of the JCP's effectiveness. They round up where the critics are coming from, how heathy the JCP is (how many JSRs are around, how quickly do they come out, etc), the dynamics of the JCP (who is involved), and how Open Source fits in.
Read the JCP Fact Based Analysis
(This is part two of the series on JCP)
Read Part One: Does the JCP adequately balance innovation with maintenance of Java's standards
Sun also just released an interview with Don Deutsch
that talks about JCP 2.5, and the future for the JCP.
Will Java ever go "open"? Is the JCP too slow?