DejaVu (formerly known as DoINoU) - http://www.aracknea-core.net/dejavu/

/dv

DejaVu keeps track of all the players you have targeted while playing the game. It shows a list of each time you met with a particular player (where and when), as well as information about the player's guild at this time, his level, your level, and if you were in a party or not. It lets you write notes about each player. DejaVu also gathers statistics about the players: Percentage of each race, class, level, etc.
DejaVu is able to communicate between guild members: Each time you target a player it will check whether one of your (online) guild-mate
likes or dislikes this player.

Simply type "/dv" to open the DejaVu window in game. Disable all chat messages with "/dv silent".

A unique feature of DejaVu is that it lets you vote for players, indicating whether you like them or not. By calling a small program that comes along DéjàVu (the WebBinder), your data is sent to the DéjàVu website, where it is accumulated with others data to score how popular (or disliked) players are. Several other useful information is also extracted from the data (eg. guild popularity, ...).

To install, simpy copy the DejaVu directory in the "World of Warcraft\Interface\AddOns" directory, or
run Install.exe

Usage:
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- Every time a player is targeted, he will be added to the database. The database is different for each of your characters.
Information about the player is displayed in the chat window, unless you set DejaVu to silent mode (/dv silent) or
unless the player is in the same party than you (to avoid spamming the chat with messages).

- Slash commands: /dejavu or /dv

/dv Opens a window listing all known players. Click on a player to have more details.
/dv silent Toggles DejaVu in silent mode: prevents messages form behing displayed in the chat window
/dv playername Displays information about player 'playername' in the chat window
/dv reset Erases the database ! Be carreful, there is no coming back !

Enjoy !