I released a 0.01 version of NateOffice today. The administrative side is still buggy as hell (thank the gods for phpMyAdmin) but the user side is working quite nicely, in my honest opinion. Still a hell of a lot of work to do, but at least maybe some people can start playing with it now.
Update: November 09, 2007: NateOffice has changed quite a lot since that initial release and there are more changes coming up that will hopefully pave the way to something with a nice UI and a 1.0 release in the next few months.
While I’m happy to provide help if I can, please use the forums and bug reporting at sourceforge.net/projects/nateoffice for this, as that way I can track the issues separately and deal with them as they come up. Additionally, there is another person now working on this project at times, and he will not notice issues if you post them here. Thanks for your interest!