Ajax

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DWR: A JavaScript/Servlet library for doing XmlHttpRequest. Includes a nifty JavaScript utility class that makes Ajax stuff (i.e. DOM manipulation) a lot easier. See Raible Designs to read about my experience.

Rico: An open-source JavaScript library for creating rich internet applications. You'd likely use this in conjuction with something like DWR.

script.aculo.us: Provides you with easy-to-use, compatible and, ultimately, totally cool JavaScript libraries to make your web sites and web applications fly, Web 2.0 style.

JSON-RPC: A JavaScript/Servlet library for doing XmlHttpRequest. Does what it's designed to do, but DWR seems better (especially because of its Spring support). See Raible Designs for a configuration how-to and opinion.

Ajax in J2EE: HowTos for doing Ajax from the J2EE Blueprint catalog. Seems pretty verbose and could probably be done easier using one of the above libraries.