Are you using this laptop solely for work, or are you looking to play games on it as well?
If you're looking for compact and work only, look for netbooks as opposed to notebooks. They're smaller, consume less power, and generally only come with XP as Vista takes up to much power.
You probably won't be able to do much more than run the OS, some music, MS Word and FFox.
What's your budget?
I'd agree with the getting a MacBook. It's a powerful machine and has some great programs and applications to boot. I've personally become so accustomed to the Mac format that it'd be hard for me to switch back. I'm constantly itching to do certain things I do on my Mac when I have to use school computers. That's beside the point though.
Get the low end aluminum MacBook if you're into that.
If you're set on PC, then look to Dell. They might not have powerful computers, but they sure as hell are sturdy.
13-inch14-inchThere are others on the Dell website, but these seem alright for work purposes.