A few samples

Hi - been using Magento paired with Drupal on client sites for several months now. I would agree with the voters below that it is totally lacking CMS functionality and an API level integration between Drupal/Magento would be idea.

But it doesn't need to be too complicated. What we have done is Theme level integrations, so for customers there is only one site. Its the hybrid community/ecommerce sites that are the biggest problem, where people could end up with 2 user accounts. I like on these stores having the users main account being the Magento one. What is needed then is when a user creates an account in Magento, a parallel account setup with the same credentials on Drupal. This would be a baby step towards a more complete integration, but for site users make things entirely seamless.

For instance at www.glazerscamera.com we have a community and all marketing pages managed on the frontend with Drupal, and then user accounts and all purchasing is Magento. Right now customers need to have 2 accounts, and we bury the drupal login in the community, would be much better if there were single sign-on.

Another example is www.demitris.com where we have the same setup, and got around the Drupal user accounts (for non-editors) by just using captcha and leaving forums, and comments open.

Another at www.soundspeedscooters.com. This whole CMS/Ecomm hybrid setup works exceptionally well for clients.

Drupal has always been behind in the ecommerce front, paid solutions like Volusion have been way ahead of development here. I was a devout Drupal EC user, but Magento just really trumped it last summer when it came out in sophistication, architecture, and development speed - I don't think EC/Uber are on similar playing fields with what is happening at Magento. One possibility I'd love to see would have Drupal Assoc embrace Magento as the preferred ecommerce app - like they did with say Open ID or jQuery - a real agreement between the two, that might lead to some interesting growth for both. Would be great for both platforms, they are very complimentary.

Regarding the Mage web services, the glazers site does a daily update job with their offline point of sale system, using the Magneto web services API. Adds new products, updates prices, qty, etc. This was great that it existed, but the update is about 1-2 seconds per record - much slower than it should be, many people talking about ways to optimize this in Mage community. I would think a module in Magento would actually be the preferred route, that somehow created mirror drupal accounts and in essence single sign-on.

Thanks for setting up the group.