I'm currently using memcache
Let's assume I have a blog post entry.
So I'll cache that so I have the tags, categories, metadata, etc. all together and fetchable via the cache.
Then I'll have a "listing of the latest entries" which I would also cache.
So, say a blog post shows up in the latest entries... and I update the title. I can break that entry's cache, but how would I update it within the list of the latest items?