If you sign up with Bonop.com you get your own promo page. And you will get several options to promote this page with eg. banners and links. If you have a video channel on Youtube.com, you can link to your promo page from each video you upload.
Keep in touch with your fans with the Bonop news feed. Every time you post something on Bonop, your sponsors will get an update, and will be reminded to support their favorite channel.