http://brainstorm.ubuntu.com/contributor/LC%20%D0%B2%D1%81%D0%B0%D0%B4%D0%BD%D0%B8%D0%BA%20cbet/his_ideas/

   Vote for a multi-seat Linux manager.

     Make one PC usable for two or more people at same time.

Right Now we can use two or even more systems in one PC, two or more monitors at once and multiple usb devices at once but not yet being able to share the same PC between two people at same time through a simple multi-user manager .

This would be a massive impulse for poor countries that cannot afford many PC's, depending on how this feature works and the processing power of a given PC multiple users could benefit from a single CPU; this way helping Ubuntu's community solving Bug # 1 by reducing the number of OS needed by PC.

Multi-core processor PC could also use different core for different user. If this feature could be implemented with a nice GUI it would be a major step for Ubuntu.