Spring 3.0 is now GA. Spring has already fully demonstrated to be a successful alternative to EJB development. JEE 6 has learnt from Spring and simplified a lot enterprise Java development, becoming much more lightweight and usable. It shows that some good degree of competition can improve the market, but I hope Spring will keep following its own philosophy instead of trying too much to compete with JEE. the risk I see is that Spring could become too wide and difficult to understand.
Spring has demonstrated that the open community can produce better products than vendors' committees, so keep doing the good job of simplifying enterprise development.