Last year my husband's family started using an online wish list for Christmas gifts. It is so amazing to be able to see what everyone wants, how badly they want it and whether or not someone else has bought it yet! It's not the prettiest site, but it does just what you need it to. You can share your list with designated groups and post links of where to buy your listed items. Check it out at http://www.christmaswishlist.net/.
P.S. Apparently you can even create a list for your pet. I was just looking at our family site and it appears that my brother-in-law made one for his dog. One of the doggie's wishes - a pass to spend the night at my house - too funny!