I've developed with Lotus Notes since R3 as well with a whole variety of competitive platforms and I can honestly say that it's the best RAD environment I've used. I can literally get working applications in front of business users within days if not hours; if properly planned and implemented you can avoid all the performance problems that Lotus Notes-bashers routinely harp on about. OK, so you're not going to run a bank on Domino, but for the vast majority of our mid-sized customers it's opened the door to the kind of applications they can only dream of affording in other technologies.