I think I decided to use the view-all page as the rel=canonical.
http://googlewebmastercentral.blogspot.com/2011/09/view-all-in-search-results.html
Best posts made by BostonWright
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RE: Would I be safe canonicalizing comments pages on the first page?posted in On-Page Optimization
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RE: What are the SEO best practices for infinite scrolling?posted in Web Design
We actually didn't end up using infinite scroll. But, if I were to use it, I'd probably just create a static html page that periodically updates throughout the day and use it as the canonical URL and for internal linking purposes. I know it's not ideal, but it's a solution I've used in the past with decent results for dynamically generated pages.