You can take screenshots via USB using the ddms app on your PC in the Android SDK or if your phone is rooted, you can download "Shootme!" or "DroCap2" from the market and install one or other or both on your phone. I use "Shootme!", mainly. (Android v2.2 on Nexus One)
Here are a couple of screenshots of my favourite screen setups.
"Ocean Waves" live wallpaper with "Splat" skin on "Beautiful Home" clock / weather widget. The water ripples behind the icons and is touch and movement sensitive.

"Earth" live wallpaper with "Naked Blue" skin on the same widget. This live wallpaper supports many diverse planets, moons and spaceships from reality and fiction. The Earth rotates, with day / night terminator accurately depicted in relation to the current time and the Moon is orbiting the Earth every 30 seconds or so.
