I get this link in my site map, but there's no post. http://thinkitcreative.com/blog/1970/01/
Assuming that something in there has been improperly date stamped, how do I find it?
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The Unix epoch is the time 00:00:00 UTC on 1 January 1970, so you are most likely getting this date because the post doesn't exist.
You can take a look in the wp_posts table and see if the post_date field for any posts show up as 1970-01-01 00:00:00.
I suppose you could just open up the sitemap.xml file and remove the entry as well?