Template actually has 2 web app frameworks built on it: Open Interact and Iajutsu.

But you can see my home node (princepawn) and see that there are many frameworks for Perl, but no objective evaluation of them all... AgentM has had good success with CGI::Application.

I personally am impressed with BingoX because all you have to do is create the database and it can generate the content entry tables for you. I dont think it's database interface BingoX::Carbon is as nice as DBIx::Recordset, but it's a nice application-level API.

Would evaluating all these web app frameworks be a useful topic for a book? Would it sell?