Thanks, that's actually a decent solution. I'd have to do some digging to find a male-to-male mic cable though. It's just too bad we can't take advantage of the micro-USB cables we all have these days. Unfortunately, I do not have a sound card with a USB output and would prefer to not have to buy additional hardware. Ideally, I'd like to use this at work, so adding hardware is not really an option (the same reason IP audio streaming apps would not work). It would be great to have my phone double as a portable speaker. I'm not an expert on Android development, but it doesn't seem like there would be many technical hurdles to streaming audio over USB...
I appreciate your suggestion though, I may end up having to resort to the mic input solution.