Depends on what you want to fill in. If you want to fill in text fields, you just go to tools->Forms->text field tool. You can use that to make text fields. Hit save and you can distribute a PDF with fillable fields.
I was able to finally track down the answer myself and thought I would share it for anyone interested....
It is actually relatively simple...
In Adobe Acrobat 9
Advanced>Extend Features in Acrobat Reader>Save Now
Thanks for coming back and posting the solution you found yourself. Not many people do that and it get frustrating to find someone else ask the exact same question but then they answer it, "Nevermind, figured it out" or something similarly unhelpful.
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