The screen on the left (with the big time) is WP Clock. The full version is only 69 cents, and gives you some nifty customizations to the live wallpaper. It also doesn't eat as much battery juice as most live wallpapers. It's a live wallpaper, so you can put icons/widgets over it in your other screens.
If you're wondering about the time widget on the right screen (the space background), that's SiMi Clock. Free from the market.
The weather widget on the right (the space background) is Beautiful Widgets, the skin is DarkLudi.