I've been brushing up on some of my Spanish recently, and found this excellent free application.
If you use multiple monitors and computers like I do, you may find this tool useful.
We all use it without thinking what it really is - so here's some facts that may [or may not] help you appreciate it more.
Are they legally dinging? Do we need them? Are they the future?
Are you trying to force users to use the www version of your site, or the opposite?