Rhapsody’s iPhone app has been updated to more closely resemble their original mobile service by enabling offline listening. Music caching, originally alluded to in October, is limited to only playlists at the moment. While the service won’t truly be feature complete until album downloads are made available and Apple provides that multitasking this summer, at a lowered $10/mo, Rhapsody is quite compelling to iPhone owners these days. Especially those who own additional Rhapsody devices, like Sonos or TiVo. However, I’m lazy easy. And mostly content with the pre-programmed “stations” as found on Slacker ($4/mo). But where the heck is their offline iPhone caching?