We've been seeing Sony's S Series Walkman around the town since July, and Sony's finally seen fit to make it official, also introducing the slightly lower-rent E Series. Specs on the former are completely in-line with expectations, including a 2.4-inch QVGA LCD, FM tuning and recording, along with support for a suite of formats including MP3, protected WMA, AAC, H.264, and WMV. Again as expected it offers battery life of 42 hour hours when playing music through headphones and 6.5 hours of video, but what we didn't know was that when you're rocking it out boom box style through the integrated speakers that drops to 17 hours and five hours oh so respectively. A palette of colorful options including black, pink, violet, and red will be available, with an 8GB model going for $110 and 16GB for $130. If that's a bit too rich for you there's the 2-inch E Series, sporting a slightly smaller chassis, slightly lower battery life (30 hours music and 4 hours video), and a slightly lower price of $80 for 8GB and $100 for 16. Both ship next month.