Magmi GitHub
This is the Official GitHub home for magmi project (Magento Mass Importer), the original Git is hosted on sourceforge but this github repo will be kept in sync.
Magmi Wiki is still hosted at sourceforge.
Magmi needs you to test it against Magento CE 1.8.x. & Magento CE 1.9.x
It should work for most of it, and maybe it's already working well.
But devil is in the details and i don't have much time doing an extensive test session.
So , if you are using Magento CE 1.8.x or CE 1.9.x , please provide bug reports for any found defects or any incompatibility you might have noticed.