It would be great if a developer created a plugin or extended their plugin to allow integration between Virtuemart/Joomla with MailChimp.
This would allow users to Connect MailChimp to Virtuemart/Joomla store access more advanced marketing tools... Such as integrated coupons, automated emails, cart recovery etc...
All the jazz is here - Sell More Stuff with MailChimp: http://eepurl.com/cXy2Bb
My understanding is that currently this can only be done by way of a third-party site, which is very costly.