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gibbergibber - 4:54 am on Aug 14, 2007 (gmt 0)
If the authority site likes what you supply them, you may well be able to start a long term content-for-links relationship with them. This is the age-old formula that TV chat shows rely on, the celebrities supply half an hour of their time and in return they get to plug a movie or book or whatever somewhere within the interview. Many celebrities appear absolutely free, because the plug alone is so valuable. It's funny, the high tech IT age is bringing us back to bartering! :-)
One thing to consider is actually writing content for the authority site. If it's well written and original, they may well want to publish it. You can then say to them it's free, but you will require a link to your own site somewhere near or within the content. For example the article might end with the phrase "For more information on Widgets, come on over to Widget Central" (and then your link here).