Has anyone done any work on this or know of a cart that can be integrated into Tango? I have a small design agency and have always used my own PHP/MySQL CMS for client sites. I'm getting a bit stretched now trying to maintain my CMS, design new website and run my design business. Adopting Tango seems to be a good idea but I want to make sure it can be extended without too much trouble. My strength is in procedural PHP - I'm guessing Tango is written in OOP?
Yes TangoCMS is OOP using a custom MVC framework. However, and this is probably a big downside: there is no documentation for the framework. There is phpdoc style comments for all functions and methods though and the code is clean.
I can help out somewhat on here or in our IRC channel (#tangocms irc.freenode.net) if needed. Though if I was you, I'd try out osCommerce for an eCommerce solution.