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ZumoCast turns your PC into a kind of media server, able to stream music, video, and even files to any other PC--or even your iPhone, iPod Touch, or iPad. (Android support is coming soon.) That neatly overcomes a major problem for mobile devices: limited storage space. Plus, it's really cool.
After installing the ZumoCast client on your PC (it's available for Macs as well) and creating an account, just choose the items you want to make available: documents, photos, music, and/or video. By default, the software pulls from your eponymous Windows folders, but you can just as easily add any other folders you want.
And that's it! As long as you leave that PC running, you'll be able to access that media elsewhere. You can listen to music on your work PC, play videos on your iPhone, grab documents on your iPad, and so on. The free ZumoCast app even lets you download selected files to your device.