Last night Apple released a new QuickTime update that allows standard definition iTunes movies to play over the new MacBooks' DisplayPort and onto older displays.
This somewhat addresses a highly publically criticized issue about how the new portables would not play legitimately purchased movies on external displays without HDCP support. However, as of now, the update is only for unibody MacBooks and MacBook Pros as well as second-revision MacBook Airs.
This update should allow for the inclusion of any display that attaches through the VGA adapter and should also allow playback from DVI-equipped displays that don’t have built in HDCP encryption. HD isn't affected as of yet since TV shows usually don’t require the use of copy protection formats.