..Nor have they been standardised;
There are essentially 3 different ways of recording DVDs, and hence 3 different media and DVD writers;
DVD-R/RW. One of two official standards. Backed by Sony, Philips, Yamaha, Mitsubishi and Ricoh, among others.
DVD-RAM. Developed principally for multi-re-recording. Backed by Toshiba and Hitachi, among others.
DVD+R/RW. NOT the same as DVD-R/RW - it's an unofficial standard with fairly widespread support. Including Sony, Philips, Yamaha, Dell, Hewlett-Packard and Verbatim. Website at
DVD-RAM, although much faster, and supporting higher re-write rates, suffers from compatibility issues; most current DVD players/DVD Roms won't play DVD-RAM discs. Not a problem if you won a DVD-RAM drive, but...
DVD-R, in my opinion, will become the Betamax, and DVD+R will be the VHS. At the moment, however, it's an open playing field - I read somewhere that Panasonic have just brought out a consumer DVD player that reads DVD-RAM...
In short, I'd advise waiting, unless you have a large amount of cash burning a hole in your pocket.
Hope this helps
CitrixEngineer@yahoo.co.uk