the best tip i have is to make links to sponsors as generic as possible then send the link to a page on your site that redirects to the sponsor site. do that for each niche for which you have traffic.
it's also a good idea to make link tables ("moneybars" as snoop calls them) to all niches and send them to the proper redirect.
that way if a sponsor has problems converting or goes out of business or flakes out on you then you wont have to work your ass off to repair the damage, just change the url for redirection on the redirect page.
that's 2 tips, i'm feeling generous tonight
