Novell has Netware and Microsoft has Active directory but what does Linux have? Is there any software for Linux that can provide a single point of administration, authentication, and storage for users, group and computer objects.
I know of two:

LinuxConf: http://www.solucorp.qc.ca/linuxconf/ and Webmin http://www.webmin.com/

WebMin uses a web interface using SSL (pretty nifty) while LinuxConf can be used from a command line via SSH or from a GUI front end.

Next this document might be helpful for administration via SSH: http://www.mandrakeuser.org/docs/secure/sssh5.html

And the LinuxConf FAQ might prove useful: http://www.solucorp.qc.ca/howto.hc?projet=linuxconf

Hope this helps.