While phones and tablets can stream a world's worth of music, their puny speakers mean listening is usually a solitary act. The Jawbone Big Jambox shares your songs, with one of the best mass-to-might ratios of any speaker we've ever seen. The secret to its serious sound is an airtight enclosure that's surrounded by a textured metal shell. Bluetooth lets it wirelessly stream songs from just about any gadget, while a built-in battery gives it up to 15 hours of song-time – long enough for all but the most regrettable parties. [$300; jawbone.com]