I've been using eBay's RSS feed since the dark ages, and am slowly switching a few of my sites over to the API. How on earth do I cache the API data? I don't need/want each page load to fetch the info over and over again. It's simple to cache the RSS feed results, but how do I cache the API data?
I use memcache to cache API results, but you could use anything... mysql or any database. I have found memcache to be the fastest and most efficient.