GTD
I just got in to GTD last week, my book hasn't even arrived yet via Amazon but I have read dozens of web pages about the process and I have my @action lists / projects / goals etc and it works great... put a whole bunch of tasks in to my dead and done file so far in the last few days.
My next step is to create a nice php/mysql interface that will sync with the text lists on my home/work desktops and my blackberry (which is on its way). So far I am using a combination of tar, openssl and scp to keep my lists synced, archived and encrypted. Fun stuff!