[Chocobean]

What kind of form....just email?

I would personally be very hesitant to fill out a form for free software (trial? full?), and be completely turned off by the prospect of having sales people contact me about it later.

Sometimes having nothing to say is a good thing.

[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.