Microsoft finally decided which recordable DVD format it will support in its next Windows version and announced that its choice for future recordable media is DVD+RW. DVD+RW is a format backed heavily by HP and Philips -- meanwhile its competitor, DVD-R/DVD-RW camp is backed by Compaq, Pioneer and Apple.
Definately Microsoft's decision is just hype in technical sense -- Windows doesn't "support" any blank recordable media now. What Microsoft's announcement means is that their next Windows version will have integrated DVD+RW burning application within the operating system. DVD-R and DVD+RW will both work just fine in all upcoming Windows versions.