Sun Microsystems now has their own alternative to Struts: JATO. Having deployed a few commercial Struts apps, I'm feeling pretty comfortable in this space. I'll try to build something using JATO instead, and report back later on how good/awful it really is.

By the way, there is now an actual standard and early access release for JavaServer Faces, a standard for UI components in thin-client applications (such as Struts and JATO). Hooray for standardization! Now if only I could get CSS into my head ....