I've been using Tablet PCs since a few years back, and I've gone through 4 of them already. And there was one similarity between all of them, I have not had a built in optical drive ever since I started using Tablet PCs. So I had to rely on external DVD drives, and there was always one little problem with all the drives I had. They had to be powered by an adapter, so I wasn't exactly fully mobile.
But now.. I found the LG GSA-E50L external DVD Multi Writer.
It's your typical USB 8x MultiFormat DVD Burner, with one notable exception. It DOESN'T come with a power adapter. Finally I found a DVD drive which can be fully powered by a FULL POWER USB port (ie it'll most likely not work if you plugged it into an unpowered hub)!! Finally I can use a DVD drive with all my tablets, the U1010, P1610 and of course.. the eeePC! Also the drive has one more little trick...
The drive is Lightscribe capable, I always wanted to try out one of these drives to see how well it works. Basically with special media (which obivously costs more than normal discs) after you burn your files, you flip the disc over and the the laser is used to burn the image onto the disc. Nifty... and is a nice touch when you need to make the disc special. It's definetly better than scriblling on the disc with a CD marker, and it's more convenient than printing and sticking labels.
This is highly recommended if you have a notebook without a built in optical drive, the convinience of not having to need a power adapter to work is immense! But you have to realise that if the USB ports are not full power ones you'll need to rely on the additional USB power cable provided in the box. MOST ports on notebooks are full power ports, but there are exceptional cases.