Portions But Not Wedding Portions
Decorating By evans000 Updated 11 Aug 2011 , 3:06pm by matthewkyrankelly
I just found this thread, maybe it will help.
http://cakecentral.com/cake-decorating-ftopict-677912.html
Here is Wilton's party & wedding servings. hth
http://www.wilton.com/cakes/making-cakes/baking-party-cake-2-inch-pans.cfm
http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm
You can type in your own portion sizes with Metria's cake calculator:
http://shinymetalobjects.net/cake/calculator/cake_calculator_byVolume.cgi
Keep in mind, venues will often cut to industry standard 1"x2"x4" (8 cu. in.) servings.
In my opinion, normal is wedding servings, but I hate this idea that everything food wise has to be super sized out there. 
Wedding portions are a little smaller because it is assumed the cake will be served after a full meal and drinks. It is also a good serving standard for cake sizes. The standard is 1x2x4 inches as KoryAk said.
Party size is generally considered for events where cake is the only food item. Birthday parties come to mind. The standard is 1.5x2x4 inches like KoryAK said.
It is a guide that depends on what is being served at the event, not the event itself. BTW those are good sizes. Prove it to yourself by cutting a piece of foam or even a couple of slices of bread to see how big it is.
Bigger sizes are serious cake eaters and should be used to buying/paying for more.
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