Customizing Finder

I was wondering if there is a way to change some of the stuff in finder, for one thing, I like how at the bottom of the finder it says how much free space is on the hard disk, but is there a way to make it also tell me how much space the folder I am looking at takes up?

thanks

you could right click the folder and get info.. it'll tell you how much its taking up. also if you select multiple folders and hold down control you can get the info for both in one window.