You can increase traffic with Deskbar: users use your web site more often. Traffic is money.
You can implement dynamic banners in Deskbar and get paid for advertising. Bear in mind that you can dynamically (without user's actions) change all content and look of Deskbar. You can also feed advertisements and gain revenues.
You can put a search box in Deskbar and drive all searches to PPC (Pay Per Click) engines and get paid for clicks.