Running Apache Geronimo in production

Answer 1

Answer to your update: It just means that SO users are not using Geronimo or are all busy voting and making witty comments.

There seems to be quite a bit of acivity on Geronimo's mailing list, and I would say that you'll get better results there.

Answer 2

WebSphere community edition is Geronimo. So IBM chose it as a platform of choice.

When choosing an application server, you're really choosing the APIs you want to use in your application and maybe the administration interface (but you only use that once in a while).