It simply replaces Blizzard's Boss Frames (boss1-boss4) with some oUF frames.
It includes Boss HP as a %, Boss Mana/Power bar, Boss's Target, and Boss's PowerBarAlt value as a % (for Onyxia, etc.). Additionally, it'll also show a Boss Cast Bar over the Boss HP whenever a cast begins.
This addon is compatible with oUF 1.5.8 and above.
Changes in 1.02:
I removed the oUF core from the addon, as the latest release by Haste has everything this addon needs. Secondly, I created a media folder to store the textures in instead of relying on the sharedmedia addon.