How should I cache database data for php?

Hello, I have a PHP content management application that I've developed. I'm looking to add data caching to it so the database doesn't get pounded all day long, the content on the site changes slowly, once or twice a day. Does anyone know of where I can look to find an application that does this? I've searched and have yet to find anything that does the same kind of thing. I'll take anything, a module or library that does it, or even some other application that does the same thing that I can look at. Ideally I think it would be cool if it would be a PEAR module that the application connects to just like the database, and it manages chaches and querying the database for data in the module. -- Jeff Bearer, RHCE Webmaster PittsburghLIVE.com