How to package up (all) installed ports

[Danny Pansters]

What would be a good way to create binary packages of all/most of my currently 
installed ports (without rebuilding as "make package" does)? 

I want to move my entire setup to another disk (array) and like to get rid of 
any acumulated junk in the process so best would be to get packages from my 
current system, make world and kernel on the new disk (array) and then 
install the packages or vice versa. Would save a few days of compiling.

Thanks,

Dan