Web Enabling Applications

Ok...wide ranging topic I'm sure, but it's Friday. Here's what I'm looking
for...opinions, solutions, ideas regarding web enabling (browser access) to
i applications. A couple of points: The logic on the i will be written
(re-written) to be accessed by a procedure call. I'm pretty sure I want the
returned data to be in JSON format. I'm obviously concerned about security
and session state. This application would be for in-house users, not the
public.

I'm thinking three main middleware paths - PHP, CGI, and vendor
proprietary...others?

Some products/frameworks that I know of are easy CGIDEV2, Renaissance,
Zend, powerEXT..others?

Feel free to contact me off list if desired. I look forward to the comments.

Thanks!