I'm trying to find a way of looking at several coins, so no specific coin at this point.

If I take a Yiimp style pool as a starting point, and they do display the current reward, however I can't find it in the API at all. It is on http://www.doufen.com/site/mining however, it is setup and filled in by javascrypt, so I can't scrape it from that page either. So I'd guess the pools are easier, but I'm still down to manually entering them at the moment. The problem with manually entering them, is like you say it changes over time, so they'd need recheck fairly often.