The new tools offer the following extra features for your domain:

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• Google Moderator — the oldest of the bunch, Moderator provides the tools for creating and moderating a discussion forum and group Q&A sessions.
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• Google Code Reviews — as the name suggests, Code Reviews gives developers a way to share code for peer review.
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• Short Links — a URL shortener not unlike the very popular TinyURL, except that this one works with your domain and can be monitored by administrators.