Have you taken a look at the jee example - that runs under Glassfish (as do the hibernate and jpa examples, and the other examples can of course be made to run under glassfish). I don't believe we currently have an example for geronimo.

We are currently working on documenting running Seam apps on other app servers (e.g. Seam 2 docs have a section for OC4J, more to come like that) and are in the process of setting up a QA lab/staff to test Seam on app servers other than JBoss AS.