Well, I have a problem with Omen working with my addons that I have. I usually have to disable some, if not all for it to actually work. Which really sucks because it is a requirement to have when I run Kara with my guild, and every time I get in, I have to sit and disable addons that I don't need, when it would be a lot easier if I didn't have to. I use it on my 70 druid on one server and on another, I would like to start using it on my priest. Here is a list of all my addons. They are a lot, but hey, I likez them :P
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Alphamap
Atlasloot
Auctioneer
Bagnon
Bartender3
Battle Minimap
Chat Edit/Scroll/Time Stamps
Chronometer
Chronos
Clearfont
Cooling
Damage Meters
EasyMail
EavesDrop
EnhToolTip
Fire
FireTree
FreeBagSlots
FuBar-QuestsFu
Improved Error Frames
Informant
Khaos
Mcom
Mobhealth3
Mobhealth3:blizzardFrames
NaturECB
NECB
Outfitter
Proximo
Quartz
SCT
Sea
TasteTheNaimbow
TitanPanel
ToolTips:Complete
WorldMapinfo
XPerl