possible to "apt-get -b source everything"

[Rogelio Bastardo <scubacuda@gmail.com>]

Apologies if this is not the best place to ask this question, but if 
I've apt-get'd some packages and then later want to recompile those from 
source (using something like apt-get -b source packagename), is that 
possible?

And what if I want to do that for everything that I've already 
downloaded?  That is, all of my packages are installed the "normal way" 
(apt-get install package), and I'd like to, if possible, mass install 
everything from source.