Someday, I would like to have users upload their business plans for other people to learn from.
Until then, there are some good commercial sites that offer sample plans. Some are free,others cost money.
http://www.answers.com/library/Business%20Plans
Take a look:
http://www.paloalto.com/ps/bp/samples.cfm
60 of them are posted for free on this website:
http://www.bplans.com/sp/businessplans.cfm