A regular sponsor is like a Home Depot, Lowes, GM Goodwrench, Interstate Batteries, Cingular, AOL, Alltell, NAPA, etc. Regular sponsors are one single company which dont have smaller divisions that they could possibly incorporate into the sponsorship deal of a car.
Marketing sponsorships would be Kellogs, General Mills, Newell-Rubbermaid, Georgia Pacific, etc. These companies are usually very large companies who own a wide range of brand products which can be incorporated into the sponsorship deal and therefore put as a paint scheme or include decals on the car. Examples are Kellogs with Frosted Flakes and their other cereals, General Mills with Cheerios and their popcorn products, Newell-Rubbermaid with Rubbermaid and Sharpie and Irwin, Georgia Pacific with their assorted paper products such as Brawny.
Because marketing sponsorships offer much more versatility for the company and the way the market their various products, we will be seeing a lot more of these marketing sponsorships in the future.
One thing is, as lucrative as Hollywood is, and with Nascar really hitting mainstream with prime time slots on NBC and FOX, we could be seeing movie companies step up and sponsor a car. Having a car in a paint scheme of the next movie to be released from the company could be something these companies look into.