This addon displays the amount of Champion XP (CXP) you have earned in the current session, along with the amount per hour. The window only displays if the Champion System is unlocked for your character.
Data is displayed in 2 columns:

The first column (in white) shows the amount of CXP you have earned this session (since logon) and the amount of CXP earned this session per hour. For the first hour, this will equal the value in the row above; after the first hour it will recalculate the average every 5 seconds.

The amount of enlightenment you have is also displayed. When you are on a level 50+ character, you will use Enlightenment when you earn XP to boost the amount of XP gained. On characters below level 50 and when you are logged off, Enlightenment increases.

Any unspent Champion Points are displayed in the 4th row using colour codes:

1. Orange - The Steed
2. Green - The Atronach
3. Blue - The Apprentice

The second column (in yellow) displays the total CXP progress to the next point expressed as a percentage. Note that this is your total progress, not how much you have earned this session. The second row displays how long you have been logged in with this character. the 4th row shows how many Champion Points you have earned in total.

Slash Commands:
/cxp - display CXP earned this session and CXP/hr in chat (suggested by QuadroTony)
/cxpreset - resets the counter for this session (suggested by Plink)
/cxpver - output version information
/cxphelp - display slash commands
/cxpmove - force window to stay visible so you can move it (toggles off after movement stops)

Always read the changelog (check the tabs at the top of this page) to see which aditions and fixes have been made. You can also read ChampionXP.rtf which is part of the package.

Take a look at QuickCompass, a battle compass for hardened warriors that also displays how much AP you've earned since entering Cyrodiil: QuickCompass