I used Exadel, but not for starting the project. I used it mostly to create the skeleton xhtml files and navigation in faces-config.
The problem with Exadel is it relies on managed beans in faces-config for autocomplete while managed beans in Seam are annotated. Then again, there is a bug with .xhtml files extensions that doesnt give you autocomplete wich I hear is a WTP bug and not an exadel bug.
An Exadel representative told me that these issues would be addressed and Seam would eventually be supported.
I tried out the JSR220ORM plugin for my entity beans and had some success, but I havent found the ideal productive environment for Seam up to now.
I'm using JBossIDE. But I must do all things with a hands in it.
I'm using NetBeans 5.0beta. I'm only investigating the examples at this point, and thanks to the build.xml I can deploy to JBoss.
I'm using Netbeans 5.0 too. With the new cvs features in NB 5 you can also checkout the whole project.