Best practice links
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If I am building links from someone with a site that agrees to link to my site and they will give me more than one link should I link to two sites or just two different pages on one of my sites?
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Either

Just make sure that if you choose to different pages that you choose good anchor text. Its nice to get he offer of a link. Also send them a nice note thanking them and keep in touch with them and don't run away after getting the link.
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I would link to my site that is more relevant to the content of the site I link from. If not, I think I would not even link ! Also make sure to use a good Anchor relevant to your landing page.