This is more or less an Adobe Acrobat Quick Tip which also ties in with a recent addition to the 'Save the planet before breakfast' wiki. Although many organisations do a decent job of enabling their PDF forms for electronic entry, there are still a lot of documents that involve the irritation of the download, print, fill-in, scan, email cycle. Here's an example that might be familiar:

We have opened the 64-8 form in Acrobat Professional and ...