Q. Can I save Adobe PDF forms in Adobe Reader after I have filled out a PDF form?
A. Yes, provided your form has had the "local save" capability turned on with Adobe LiveCycle Reader Extensions. Team members both inside and outside an organization have access to and can interact with forms. You can easily open, fill out and submit PDF forms, even from handheld devices and over wireless connections. However, if the "local save" capability has not been activated in your PDF form, you will not be able to save the form data with Adobe Reader.
Q. (@Adobe): Did you really feel that was a sufficient and suitable answer to this question. Just make it goddamn free and built-in already!