If you are Coca Cola - and you want to add additional traffic to the main site, how would they handle these two additional domains:
pop.com and soda.com
(assuming that you don't want to create new websites or web pages)
domain aliasing or url forward
If so url forward from your registrar if you have the option. The four registrars I use do and they work seemlessly.
Do note that some registrars charge a few Dollars for this service.