One of the trends on Facebook fan pages is using an oversized logo to make a bigger impact. It can be up to 200px wide by 600px high.
One of the problems with an oversized logo is determining which part will be scaled down to make the avatar for the fan page. I used to think that you had to measure out the right segment and have the area you wanted to be the avatar in a specific part of the larger logo. And maybe it used to be this way and I missed that there was a better way. Or maybe the better way is a newer feature (it’s not like Facebook changes things every other day and is poor at communication).
But there’s a really easy way to select the avatar from the larger logo.