There will always be a niche for dedicated ecommerce software like Magento, but from what I see, more and more people are building their ecommerce sites with ecommerce plugins for Drupal, Joomla, WordPress etc. Not so much SilverStripe but that could be about to change...
(stand by for rallying cry...)
The ecommerce module is of strategic importance for SilverStripe. A great ecommerce plugin will make all of our SilverStripe skills more valuable, and more likely that our clients have heard of it before we propose it. So lets give Jeremy and Nicolaas all the support they need.
e.g. do you have some code for a payment gateway that's not already supported? Do you have some neat code that could be made into a tutorial or recipe? Once you get your head around a class despite minimal documentation, put it right by adding comments to the code in such a way that it ends up here...
http://api.silverstripe.org/modules/ecommerce/trunk/
..by the magic of phpDocumentor.