The next generation of portable cool has arrived. Excessively sleek, the Rio 600 from S3 (800/468-5846, http://www.riohome.com ) is how MP3 players would look if Starfleet got into the consumer electronics business. All gently sloping curves and soothing colors, the 600 inspires pure aesthetic lust in even the most sedate starship captain. It plays the MP3 and Windows media formats, and you can upgrade to support future formats. You can also boost memory to 372MB. Unfortunately, the $170 Rio 600 ships with an anemic 32MB of memory, enough for an hour of Klingon-quality sound or a measly half-hour of tunes fit for human ears. Looks, brains, play-time: two out of three ain't bad.