Hard Drive Partitions - Install Them In The Appropriate Sub Folder.

Sometime early next year I will be building a new system. The system will likely have one large hard drive. As of now I will be installing XP Pro. I was curious how everyone else splits up their drive. How big of a partition is generally created for the OS. And do most people partition the remaining space.Now a file architecture question. When non OS applications games, utilities, MS Office, etc.) are installed do most people put then in D:Program Files Or create separate sub-folders for the broad categories and install them in the appropriate sub folder.