I recently needed a shopping cart/ecommerce solution for a client but found that obvious choices such as Magento, Joomla or even Wordpress didn't quite fit my clients needs. I needed something very simple and Paypal integrated without all the bells and whistles of a major software.
I ended up creating a simple cart of my own. You can try it out at: http://simonbray.co.uk/colour.php
The site isn't finished but that pages works well enough to demonstrate.
Well if anyones interested I'm selling it at $3 per copy. Feel free to make edits once you've got it. As I said it's very simple, but quite effective. If there is enough interested I may add a simple CMS among other things.
Payment method: Paypal
Exchange method: Over msn/download link.