LOL, that was a bit ambiguous, wasn't it?
memo to self: don't post this kind of thing whilst at work and in a hurry! 
DC stands for Distributed Computing, a process where your computers idle cycles are uses to perform calculations or manipulations as part of a bigger, wider, research project. Some DC's do stuff like help in the search for alien life forms (eg seti@home), try to break encryption coding (eg ecc2), map the human genome/DNA (eg genome@home, folding@home), or help to find cures/better treatment for diseases (eg AIDS, UD,
FaD).
Each DC uses a piece of software you download and run on your machine. The DC's may operate slightly differently in what the require and how they run (eg only as a screensaver, only when idle, or take over whole CPU), so you need to match your PC capabilities and the use of your PC with an appropriate DC that you are willing to assist with.
Now, what I meant about FaD is that the software you download and run is very unobtrusive. It can run automatically whenever your computer is on, and doesn't seem to slow down any tasks you perform (ie it gets out of the way when you want to use your PC, and doesn't seem to slow use down, whilst making good use of idle CPU cycles.) You can turn your PC on and off without losing work already performed, and you can set how often you send results back and how many new pieces of "work" you download ready to do.
FaD also seems to have low system requirements, unlike some of the more
flashy DC's like UD and ecc2, which need fast processors and lots of RAM. FaD runs really well on my P133 with 32MB RAM.
Although the principle behind DC's is altruism, there is a bit of fun and competition as you generate
points for your work, and can have these points allocated to a specific
team. TechIMO has a current team in FaD, and we can have friendly competitions both within the team (like me and mondobyte!

) as well as with other teams (like all the teams TechIMO will pass soon!

).
So, is that more simple, JK?
Come one, give it a try!! Just download for the link above and run the program. Follow the instructions on the download page and you should be fine. If you have any questions, just ask!
Cheers
Mick