Looks like things have changed a bit since last week when I posted.
With the announcement yesterday of BlazeDS (scheduled for release 2008), it seems the libraries mentioned will be available under the LGPL v3, so I believe you may be able to redistribute them (unmodified and probably as a separate installer/archive) under the terms of the LGPL.
http://labs.adobe.com/technologies/blazeds/It sounds like there will be some features not included in the OSS version of Data Services, but from reading the FAQ it seems that the messaging API you mentioned will be included in the LGPL licenced version.