Hey {NAME},
I was speed-reading (not sleepwalking!) through a number of articles about {keyword} when I came across yours: {INSERT LINK TO THEIR ARTICLE}.
My client has this piece of content that could make your amazeballs write-up even better.
If you agree with using their article as a valuable resource from your page, we can:
Transfer some $$$ to your Paypal account.
Or how about gaining additional exposure online? We can share your content via our sister sites.
Hoping for your sweet YES, we just adore your site =)