I have a Samsung top bit (tablet) with a Sondstrom keyboard that comes separately. They can be linked with a neat case that also allows you to stand the tablet bit upright for typing/viewing. The whole thing is compact and very light to carry. I find it very useful (am using it now). All bought from PC World at reasonable cost.
What do you mean by that anniebach? A tablet that can have a separate keyboard or a laptop that comes to bits? I'm sure I'm not expressing myself very well! Wish wobblybits was around to comment. Sorry. Not being very helpful!