We've added support to ActiveSOAP for XStream making it easy to expose POJOs over REST or SOAP endpoints using XStream's simple & fast XML serialization. There are some examples here.

So now we've the best of both worlds.

You can happily mix and match both approaches, together with any other kinds of XML binding tools you wish - all using a simple & lightweight REST/SOAP framework with pluggable transports for HTTP and JMS.