The problem is that expression language support is part of the JSP 2.0 specification and our JSP editor and compiler are JSP 1.2 compliant. However, due to popular demand, we’ve added support for expression language in our internal builds and it will be available in the next service release. See, your feedback really does drive the product direction. 🙂
In the meantime, if you want to continue to use the taglibs and are deploying to a JSP 2.0-compliant container, you can turn off JSP compilation (on the JSP editor’s syntax preference page).
–Scott
MyEclipse Support