It is a good feature to be able to add additional people to an opportunity -- most sales are a team effort among co-workers, vendors, and contractors.
It is a shame, though, that when contacts are added to the opportunity that the company name associated with the opportunity defaults to the contact's company which is the first in alphabetical order. So, if an opportunity is being tracked for company "Zebulon" but then a 2nd contact is added who works for "American Twits", the company "America Twits" shows up in the company column.
I cant' think of a good reason why we would want this. Please default the company listing to the company for which the opportunity was created or give us the option of checking a box to say this is the listed company. I am now having to add the company name as part of the opportunity name. This doesn't really save many keystrokes.