We're developing applications for AppExchange and are trying to figure out the best way to do development and release management. There are several issues around this:

1) Package Prefixes. We are developing code in unmanaged mode and releasing as managed, so we have to add all the package prefixes into the code. Is there a way to do this dynamically at runtime? Right now we're using an Ant script, which stops us benefitting from the force.com IDE plugin.

2) Resource files... We are doing some ajax-ey stuff and as a result have a few different resource files we upload, some of which are multiple file resources (zip files). Has anyone automated the building of these resources using ANT, and does that work well?

Our environment seems very fragile and works for some developers and not others; have other people had this problem? How did you resolve it?