[anujseth]

A form with just the persons name and email and optionally organization and how they plan to use the software. Something similar but much shorter from the optional one already on the download page.

Its the full version without any restrictions except it contains a watermark that links back to the site.

Even if I did put a compulsory form I would make it clear that you'll only be contacted for suggestions on product direction and never ever a sales pitch.