I don't use any of the Eberron stuff. I've never liked the setting. However, since there are people who do like it for whatever reason, keeping a minimum level of Eberron specific adventures in Dungeon is fine by me. I think the ratio is about right as it is. Personally, I'd like to see alot more Greyhawk stuff, but I can live with what we get in Dungeon.
-Crypt Rat