I just started using ICagenda, love it! And of course i am patiently waiting for the registration update, in advance of that i have a question about this update: will it be able to remember user details like name and address so users do not have to fill out all basic information with each registration? That would make this extension 100% perfect for me!

Yes, you can retrieve the name, phone number, number of people present at the event, and there are also system to manage a newsletter to communicate with registrants.