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Is there any way to automatically generate a provisioning script based on what was installed on the guest machine? For example, I do "vagrant ssh" and then install my whole development environment and it creates a script to do it every time based on what changed?

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Look at blueprint: https://github.com/devstructure/blueprint/

Right now it has frontends for bcfg2, cfengine, chef, puppet and shell scripts. It's not perfect, but it does a pretty good job of giving you a base set of provisioning rules you can then refine by hand.

Not within Vagrant itself. This is really the realm of configuration management tools. As far as I know, no tools do this reverse engineering because it is a fundamentally very difficult problem, but many of the config mgmt tools make it very easy to translate shell commands to rudimentary scripts for their systems.

Vagrant doesn't, but blueprint[0] seems to be a decent tool for generating puppet manifests. I haven't used it personally, but an Ops guy at work has had some success with it.

[0]http://devstructure.com/blueprint/

Puppet has some limited support for generating manifests based on the state of an existing system: http://docs.puppetlabs.com/man/resource.html

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