I have a Mac Pro at home and I'm using a Macbook Pro on the street. I like to have server services for access, like VPN, iCalc Server, File Sharing, FTP, AFP. So instead to install all this services on Leopard client or make a dual boot with OSX Leopard Server. So i have install OSX Leopard Server as a primary OS and i have all applications that i have use at OSX Leopard Client and everything seams to work so far.
One thing i have learned is better to install and setup a primary account as Administrator, and later add a user account for work. so if you have any problems you login as a Administrator and resolve the problem instead of reinstall the OS.
For setup a good setup install Leopard Server as a Advanced and don't add any service. I have found a very good Tutorial to setup Leopard Server DNS and Open Directory:
http://www.makemacwork.com/master-open-directory-1.htm
http://www.makemacwork.com/master-open-directory-2.htm
After you do this you can add OSX Clients and to laptops a good thing to use is mobile account that will be in sync with the Server.
Another good series of video tutorials at iTunes Podcasts:
