can I somehow take a screen shot of a google maps in a
easy way and then send it via MMS?
HTC Desire on 2.1 (not rooted)
Only if you're rooted. See this answer: How to take a screenshot with an Android device?
Try Map It!
It won't let you send anything from the Maps App, but the Map It! app uses Google Maps and lets you draw routes and put push pins into the map, then take a screenshot of it and send it via email or MMS.
It's useful if you want to send a picture of a particular place on a map or some kind of mock up to a map, but it's no good if you're trying to send the route that you already mapped out in the separate Maps app. To do this, I believe, you'd have to draw the route by hand on the map in Map It.
Also, you should note that it puts an ad at the top of the screen (in the same way other apps do this), and when you take your screenshot, it will show that ad too. There is an Ad Free version that I haven't tried.