I liked the way the Gypsy Player frame had the XP under the mana/rage/energy display. However, I'm a huge fan of CT Mod and liked the lightweight UI that comes with that mod.
I made this AddOn to get the gypsy XP display on my CT Mod player frames but this is a totally standalone AddOn and does not require either Gypsy or CT addons to be installed.
One feature this AddOn has over the Gypsy unit frame's xp bar is that this one hides when your character is level 60.
*Note about the Screenshot*
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Keep in mind that the screenshot shows some features of CT Mod -- the part this AddOn provides is the XP bar and XP text docked under the mana bar.
PlayerXP
PlayerXP