Users can preview two new Adobe products, Flash Catalyst and Flash Builder 4, starting today. Both programs aim to simplify the process of designing Web applications. Catalyst, which has never before been released to the public, is aimed at designers. Built to resemble Illustrator and other Adobe products, Catalyst allows a nonprogrammer to design working interfaces for Web applications. Builder, which updates a previous product called Flex Builder, is aimed at developers. Specifically, it's a tool for developers building Internet applications, and Adobe says that it has been improved to better handle data and to work easily with Catalyst.