Company field in the address.

Often I receive my orders at my company. What about adding a new field `company` in the address ?

Other fields could be useful too (a phone number for example). 

As I don't know if you want to keep the form as simple as simple, I did not touch it. What's the best ? Adding the new field(s) directly in AddressType,  creating a new form, or using options for AddressType ?