Typewriter Tool for Adobe Reader (Free)

Adobe has released a free tool called the Typewriter Tool.  This feature is included in the latest version the free Acrobat Reader (ver. 7.05) and allows one to enter text into a PDF document.  In other words, if you have a PDF document that is a form that you would normally print out and use a typewriter to fill out, then you can simply use this tool to do what you would do with an ordinary typewriter.  If you have version 7.0 of Adobe Reader and need to update it click here (Windows) or here (Mac).

Source: http://www.pdfforlawyers.com/2006/01/free_typewriter.html