That wasn't too miserable. v0.06 of the Brad Sucks Digital Download Store is up with a pretty big overhaul:

• bsdds has its own shopping cart now instead of using paypal's -- should allow alternate payment methods
• zero dollar downloads
• buyer/downloader is now redirected to the download page post-transfer if PDT is turned on in paypal preferences)

The shopping cart needs some CSS love but that'll have to wait as I got things to do.

Just uploaded a new version of the Brad Sucks Digital Download Store. Two big changes:

• No longer requires Amazon S3. Your store files can be local and links will expire after your given duration (mod_rewrite required).
• Variable prices via text input. Previously variable prices could only be selected via a pre-defined list in the drop down. Now buyers can specify whatever they want as long as it's more than zero.

Next stuff I'll be adding:

• Integrate a shopping cart I wrote so that other payment options are possible (Google Checkout/VISA/etc).
• Handle zero dollar downloads.

Hooray for work!