I\'ve got the Android SDK downloaded, got a AVD booted and running, but haven\'t been able to find the Marketplace application. Do the images available through the SDK util
You can have a look at the Android source. Some of the "native" applications are included.
http://source.android.com/source/git-repo.html
The link provided by Ham is for 1.5/1.6, from the tags below the article you can go to this page where you can find instructions for 2.2.
According to this article you can add the marketplace to your emulator. Don't know if this still works but could be worth a try. Why do you need the marketplace for development anyway? ;)
This 2 part video walks you through how to get the marketplace and the gmail app onto an android 2.2 emulator: http://www.youtube.com/watch?v=Xe-jA3l3QNA
This link also covers it (http://anythingsimple.blogspot.com/2010/09/how-to-use-android-market-on-android.html) but I found the video to be a bit more useful.