I am looking to setup a laptop I use for work as follows. One partition with a Linux install (Backtrack) with tools, normal write, etc. I want to create a second partition with a one-time use setup; i.e., its regular unbuntu or something that I can use for email, youtube, etc that when I kill the power everything is lost. Ideally, I could also boot the onetime use partition in write mode to make changes or upgrades, but in general I want to keep everything isolated. I do not want to use a USB or live disc.
How should I go about this setup, and is there anything else I should consider? Maybe a third partition to save files off when absolutely necessary?
I also want to ensure that the Backtrack partition is encrypted to protect client data. I wouldn't imagine that would cause any issues here, but thought I should ask.