Struts w/ Tiles

Agility

Editing pages is quick and easy, but adding new pages or new tiles is irritating, requiring lots of XML.

Support

Struts is well supported, and is the de-facto standard for web-app development right now.

Skinability

Tiles could be very useful here.

Performance / Scalability

Adequate.

I8ln

Since it's JSP, just use jstl tags for this.

Expression / Templating Language

JSP based.

Componentization

Tiles are sort of like components, but not as flexible as Tapestry's components.

Summary

Struts is another safe bet - everyone knows how to use it, and it's known to work. Tiles is nice for laying out pages and could be useful for skinning. Config is really annoying though.