I use my PC as a dvd player with the joys of TV out, and it's worth it just for the stunning sound quality.
That said, just about every new PC in the last year or so has come equipped with a DVD drive. I think that once DVD-r comes down sufficiently, using it for transferring files will be a big plus (4.7 gig, anyone?)
Also, dvd software is <slowly> starting to trickle into everyday use - I picked up a DVD version of Baldurs Gate for $10, and it is fantastic compared to the 5 CD original.
Given that the price overhead is minimal, it's definitely worth it.