(UPDATE: As I was going through old posts I found this one. InDesign CS6 finally added the capability of creating form fields in InDesign, rendering this post obsolete. So if you stumble across this post looking for a way to create form fields in InDesign, the best answer, now, is to upgrade to at least CS6. In CS6 and newer, go to Window: Interactive: Buttons & Forms. Enjoy! The rest of the article below is for CS5.5 and previous.)
InDesigners have wanted to to do this for for years … and now, we can. Well, sort of. There is a new script for Acrobat Pro that will convert buttons created in InDesign and exported to PDF into form fields. More information available at InDesign Secrets:
I’ve not tested it myself yet, but it sounds like such a great tool I wanted to post a quick announcement about it.