Being JavaScript crazy, i have little excitement when it comes to JSP expressions other non AJAX data rendering. But recently, i managed to understand something referred to as OGNL an Opensource fix on behalf of data handling through expressions. OGNL is pretty well utilized in Struts 2 framework as part of the Client segment. OGNL in Struts 2 basically provides a rich set of interfaces to access the call stack which is otherwise referred to as as ActionContext. This makes the data/parameter handling simple as well as clean.
I trust OSS efforts like these have quite a good possibility to find their space in web 2.0. And more importantly Object/data notation require more standardization in the world wide web. One can give a endeavour of Struts 2.0 considering the simplicity as well as power of OGNL expressions. This OGNL adds to my recent favourites inline  JSON.