Check / Remove Installed Features

In many cases that I faced installing / uninstaling features can create several problems. Some of the problems that I ran into (either myself or my colleagues).
In many cases that I faced installing / uninstaling features can create several problems. Some of the problems that I ran into (either myself or my colleagues):
When you uninstall a feature and reinstall it again with the updated version it misbehaves, or still taking things from the older version. Though, you cannot see the older version of this feature to uninstall it completely or fix it.
When you install some features and you want to to use the "Content Deployment" tool for your site collection it fails because you did not install the same features on both the farms: The error message you might get starts with this line: FatalError: Failed to compare two elements in the array.
Stefan Goßner has found a nice solutions. He write two tools. One to check the features installed and analyze th existence of each feature. The other is to remove the feature completely from the command line permanently.
Analyze Features Tool:http://code.msdn.microsoft.com/WssAnalyzeFeatures
Remove Features Tool:http://code.msdn.microsoft.com/WssRemoveFeatureFrom
Stefan has a blog entry about the content deployment problem with this tool to resolve on this URL:http://blogs.technet.com/stefan_gossner/archive/2008/04/12/moss-common-issue-content-deployment-fails-with-failed-to-compare-two-elements-in-the-array.aspx