I meant, that if you search from something (tag) in 10 posts you will hardly get the same, if you do it for another 10... meaning sometimes people use tags because there is a little section on the post they talk about it, but because it might be too little, the representation of that tag is not very accurate.

Was more like a sarcastic rant... =) no big deal. Anyhow the ecency search engine is very good for it, compared with just going using tags.