This link opens to a really neat backgammon applet, free of course. You'll need java installed and enabled to play it. It's been around since 1996, it's fast, and there are no bugs. It's pretty tough to beat, it doubles on you very early if it gets even a bit ahead. It's got a cool drag & drop interface for moving the "checkers" as he calls them. I won my first game today, and no others. I refuse to admit how many times the little bugger beat me.
You might want to check out the page before it:Rules, Statistics, How the Applet works
I've been having fun with this for years, the link has never changed, have fun with it.