I do a lot of signups for example on webmaster forums and sites that require you to be registered to view the content. Its a tedious task to enter the information that are required by hand. You often have to add more information than the username and password, name and location for instance.
Auto It is able to help you fill those fields automatically, but not only that. It uses a combination of simulated keystrokes, mouse movement and window/control manipulation in order to automate tasks. AutoIt v3 is a freeware BASIC-like scripting language designed for automating the Windows GUI and general scripting.
The tool is free and small (only 115 KB), check the authors homepage at autoitscript.com to download the newest version.
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Seriously who fills out these forms correctly? AND more than you have to. What would be useful is a random name/adress etc. generator. Then a one time e-mail adress and there you go. For official Forms there would also be the correct data.
The tool can automate almost everything. Windows setups for instance
Another good autofiller is the BugMeNot Firefox extension
at http://bugmenot.com.