Cake cutting guides

I frequently get asked what size cake pan should be used to feed a certain number of guests. To which my reply is always, "depends how big you want to cut the pieces". Here is Wilton's guide for cutting cake, using a variety of different shaped tins.
http://www.wilton.com/cakes/cake-cutting-guides/wedding-cake-cutting-guide.cfm
And for sheet cakes
http://www.wilton.com/cakes/cake-cutting-guides/party-cake-cutting-guide.cfm