MicrostockGroup

Recently I was approached by a marketing rep for a company that makes certain handheld electronic devices about doing photoshoots of their product being used in a variety of scenarios and then putting these images on Istock for both their useage as well as public useage for greater exposure of their product.

I told this rep that in order for me to do this Id need a property release from someone within their company who would be authorized to sign and authorize such a documen or else Id be extremely limited with what would be considered acceptable without copyright infringement.
The rep seemed to think he could get such authorization, so now I've never worked with property releases before and I was wondering if there's a good generic property release that others have had success with across the major agencies as Id also like to submit these images to more than just Istock ( I retain full rights to all images that I take).
There's also the matter of having a witness signing the release, but we're too far apart to physically sign it in one place; does that pose a problem?  Any feedback and suggestions would be appreciated.

There is a generic release on both Istock and Getty. All three of you have to sign release at the same date. Maybe they have some representative in your area to sign release for them.