Magoo1, welcome to TFL. I got interested for basically the same reasons, about 18 months ago. Keep buying guns - you're right ... this isn't going to get better soon.
A ghost ring sight is also known as a peep sight - the rear sight is a ring, through which you find your front sight. On shotguns, that front sight is usually a blade sight in a ghost ring setup.
Although it is hard to make out, here is a ghost ring sight setup at Scattergun Tech:
http://www.scattergun.com/scattergun/GhostRing.htm
and, here is another look at the MMC ghost ring from Vang Comp:
http://www.vangcomp.com/870_acc_mmc.htm
Finally, here is MMC's sight again, with a bit more info (seems like a lot of folks think MMC's sights are one of the best):
http://www.mmcsight.com/mmcghost.html
Regards from AZ
[This message has been edited by Jeff Thomas (edited April 16, 2000).]