Building Packages - Links to Tutorials?

[Drew Tomlinson]

I have a "faster" machine that I'd like to use to build packages and 
then install those packages on my "slower" machine.  I'm looking for 
links to info describing this process and some best practices.  I'm 
familiar with using portupgrade to build and install ports.  I've read 
the portupgrade man pages and see options to build and install packages 
but am not understanding how to put it all together.

Any links appreciated.

Thanks,

Drew