You have to be rooted to take screenshots if you're not running gingerbread, or you can install the Android SDK and you can take screenshots with it.
I've been using this app called TIKL, it's for iOS and Android. It's a Push-to-talk/walkie talkie app. Works pretty good, you can talk to multiple people on both platforms.
https://market.android.com/details?id=mobi.androidcloud.app.ptt.client&feature=search_result