This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
AFAIK you can render anything you want, check out Tiles, jsp:include action vs jsp include directive and s:include vs s:action.
Although i haven't tried it myself there still are frames and you can build custom jsp tags yourself.