Pioneer has put out a DVD burner that is so compact, it could easily be mistaken for a CD case.  The company claims the DVR-XD09 is the most compact design yet, and includes all the usual features including reading, writing, dual-layer, as well as DVD plus and minus.  It is powered by a USB 2.0, and has top writing speeds for 8x single-layer and 6x on double-layer media.  You should be able to purchase it this month for $79.99 in August.