Steemd is almost always open in my browser.

You can almost see every activity in your account on that site.
For example upvotes (your own upvotes and received upvotes as well), comments (your own and received cooments), your own resteems, author and curation rewards, your witness votes, transactions (including buy and sell orders) on the internal Currency Market, transfers from/to your wallet and other things, almost everything.
With SteemWorld (beta), you can check other Steemit related statistics, such as the overall number of your upvotes and the number of the received upvotes, self upvote percentage in the last 7 days, upcoming author rewards and many other things.

You can also find very detailed Steemit related statistics in many categories on Steem Reports.
Such as Account Voting, Vote Charts, Financial, Delegation, Developers, Visibility, Witnesses, Sincerity and Other Tools.
You can even check someone's (including your own) self upvote percentage for the last 31 days on this site.

I think there is possible to write a completele book (or even more) about these things. I think that creating/maintaining a Wiki page about Steemit and these services would be a good idea.