I downloaded this yestday and it looks great! I would like to see 2-3 form fields added so custom text fields can be added to products. I am webmaster for a  politcal party in a state that requires contributors to specify there employer and occupation. If this was added to the Product settings, I could combine the donations, event ticket purchases and merchandise offerings all within the store module.  I'm sure other shops would benefit from text field availbilty on product listings especially when dealing with specialty or personalized items.

This is a very useful feature, particularly the ability to affect price (t-shirts for example, usually have XXL size that costs a few bucks more).  On thing to consider is many catalog shopping system only provide the appearance that the attribute is affecting the sales price, when behind the scenes each size (in the case of t-shirt example) is actually a unique product.  The more-robust systems allow the creation of "matrix" or "master-variant" products that allow configuration of an abstract master product that ties together multiple "variants" (size, color, etc).  The nice thing about this approach is that it provides foundation to maintain sku, part number, etc. for each variant.

I'm excited about this project!

You should probably go through Rob (robertc@willowtreesoftware.com) if you want to contribute any code to the project. Thanks.