DaHUD was originally written by Benumbed. He has gone away now, or at least apparently abandoned the project.
I have been using DaHUD since about the middle of the last expansion, or it feels like it. It was highly configurable and pretty reliable. I just wanted it to look like drathal's hud. I finally managed to make a plugin for DaHUD to do just that.
Then Lich King came out and broke a few things. Actually, the mod worked but spit out a lot of errors for missing or changed spellids. There may be other things, but I haven't seen them.
I quickly patched up the holes and went on with it suppressing the LUA errors. I waited a time to see if Benumbed would updated it. I also was engaged in playing the game.
I believe sufficient time has now passed. This has no new features. For the technically minded, what I did was find that several functions and variables were no longer required due to changes in how UnitBuffs() works now.
So, the end result is its a little smaller and takes a little less memory as there is no longer a requirement to keep a database of spells each class can cast on each other an enemies in order to determine if a buff/debuff was cast by the player (for the large buff icon module).
I played with the errors on all day yesterday and not one popped up. That doesn't mean one isn't hiding anywhere just like any other piece of software.
I have no plans or desire to add any new features or make any new display modules. It is already very configurable.
This is basically DaHud without the missing spellid errors.
Enjoy.