DVDs (granted they're only 'free' after you buy them)
FOX's website & I think Fancast still has them.
you can watch free mad tv episodes or any tv show or movies for free at www.tvshack.net
One can view free episodes of Family Guy through several places online, in particular on OVGuide or AdultSwim (in the video section). Here one can view free full length episodes of Family Guy.
The series is available their own website.
Sometimes the company that makes the show will offer some, if not all episodes on their official website. Seeking out forums is also a great way to find video links. However most of the sites that provide videos are illegal and can contain malicious software.
cucirca.com hulu.com
You can watch all the episodes for free at Funimation.com
One of the most popular places to watch Family Guy episodes online for free is Hulu. Additionally, the AdultSwim and ABC websites have many episodes.
You can also catch full episodes on Fox's website! They put up the new episode the day after the airing.
help people!
Bearshare
You can watch them in netflix.com but you need to create a free account.