I mostly use my laptop by connecting to a wifi hotspot, and then connecting to my desktop at home using Windows' Remote Desktop Client (RDP protocol). That way, I don't have to install all my software on my laptop, and keeping both hosts in sync.
To save battery time on my laptop, I'm thinking of booting from a USB key running some Linux liveCD, connecting to my desktop using rDesktop, and then shutting down the hard drive.
I have a couple of questions:
What distro would you recommend for this use? Since I'm not running much locally, except a browser and rDesktop, I don't need a heavy distro like Ubuntu
Will I really save battery by shutting down the HD, or is the screen the biggest power user?
Are there alternatives to rDesktop I should know about?