Halo 2 delay due to "partial nudity" on EuroGamer offers an explanation for the latest delay to the Windows Vista edition of Halo 2, saying some partial nudity was included in the production code. The "problem" will be solved by an automatic update upon logging in to Windows Live, and there is also a manual patch in the downloads area on the Halo 2 for Windows Vista Website. Here's the Microsoft statement about all this:

"It has come to our attention that an unfortunate, obscure content error which includes partial nudity was included in our initial production of Halo 2 for Windows Vista.

"As such, we have updated the initial game packaging at retailers with a label, so customers are aware before purchasing the game... This packaging will only be labelled for the initial run of games; subsequent shipments will not include the content."