http://www.wowinterface.com/downloads/info10399-SimpleThreatMeter.html
I created this back in mid-TBC and have maintained it off and on ever since.
The whole goal is to make it as easy as possible for the player to assess their threat situation.
I use Omen myself as well, because there are always odd gimic fights, where you need multiple tanks above you, or I might need to keep threat and know who is under me and how far.
For the other 95% of fights though, all I really care about is how close I am to pulling aggro off the tank of what I am hitting and that's what this mod is designed to deal with simply and configurably.
Oh yeah, and I wanted a VERTICAL bar, not just another horizontal bar somewhere.
I've still got on my TO DO list - warnings, both visual (text to /rw or SCT/MSBT etc) and audio (play a selected sound) and that should be done soon.
Thoughts?