When using Adobe Reader, for a PDF form to be able to be filled in and saved with the data retained, the form must be "Reader Extended". This process enables extended functionality in Reader such as "saviung a form with the data, enabling digital signatures in reader etc.... The Adobe LiveCycle Raeder Extensions product is required to "extend" PDFs.
If you are using Acrobat Pro to fill in a PDF form, you can the form with data.
Thank you Steve!