Sounds like what Carly is talking about is Chitosan. It's a marine fibre that binds fat in the digestive tract, preventing it from being absorbed through the stomach.
I have been taking this myself for many years... only before a fatty meal though. Especially usefull when going out to dinner, when you don't know what you are going to get! Also, if you're having takeaway etc.
The brand I get at the moment is Thompson's Fat Blocker. You can sometimes find it in a health food shop, but it costs about $45 for a bottle of 120. So, I go to http://www.CompleteHealth.com.au
and it's only $27.95.
I have heard that it can absorb anywhere from 4 up to 12 times its weight in fat. So, the 8 times could be quite correct!
I discovered today, that Admin Censored also sell it. I was chatting with a girl who has recently joined up. Apparently their Chitosan supplement also contains an ingredient that turns into a gel in the stomach and makes you feel more full. Interesting
It's more expensive though, and contains less chitosan, so I think I'll just stick with the Thompson's