Voting and Moderation

• Upvotes Over Time - shows how many votes each post received on average over time.
• Percentage of questions closed - shows a simple rundown of total questions, closed questions, and the percentage of questions closed.

Post Statistics

• Distribution of Votes on Answers - shows how many answers have how many votes. I find the graph most interesting here.
• Distribution of Votes on Questions - shows how many questions have how many votes. Again, the graph is very interesting.
• Asked/Closed/Reopened per week - shows the number of questions asked, closed and reopened together in a graph.
• Number of questions with respective number of answers - shows the number of questions that has each specific number of answers. (For example, how many questions have 0 answers, 1 answer, 2 answers, ..., 10 answers, ...)

Posts to Watch

• Possible low-quality answers - gives a list of answers which satisfy some common criteria of low-quality answers. Note that being in this list does not automatically make an answer low quality, they should still be evaluated on their own merits.

Users

• Distinct Contributors per week - shows the number of different users engaged in different activities per week. Taken directly from TWP.
• New Users per week - shows the number of new users who joined each week. Again, from TWP.
• New User Progress - shows newly-contributing users, showing numbers of questions/answers and rep.

Tags

• Tag Usage over time - shows how much a tag has been used over time as a graph of number of posts against time.

General Activity/Utility

• Site Activity and Voting graph - a graph of significant stats like votes, questions and answers, all per week. Copied from TWP.