Dell and Sony are both expected to launch their first Media Center PCs this fall, sources familiar with the companies' plans told CNET News.com (http://news.com.com/2100-1042_3-5071510.html?tag=lh).

The two companies did not offer computers using the initial version of the Windows XP Media Center operating system, but are expected to enter the market once Microsoft introduces a new version of the operating system later this month. Microsoft has scheduled events across the United States on Sept. 30 to unveil the next version of Media Center, code-named Harmony.