I don't know but it certainly works with Facebook login via Janrain Engage, so you can have the same sort of login as to the Ecwid control panel.
There are a couple of things that could use some improvement:
If you have hidden the Ecwid login links and only use the ones in Joomla, people will not be prompted to login and instead just checkout without registering (not a problem though). So far I have quite a lot of people registering but only one of these actually placed an order while being logged in.
When a registered customers tries to check on the progress of an order and is asked to log in, they will not have the ability to do so if they have registered through Janrain as they do not have an Ecwid password. (If they are clever, they could probably also open up a Joomla tab and log in there)
Last edited by slice; 08-12-2011 at 02:18 PM.
Reason: added 'not'