Quick question for all of you whose primary language isn't English: is the "th" consonant cluster the most difficult one to pronounce? I notice a lot of people pronounce it as more of just a "t" sound.
I know many of my classmates, who either pronounce it as "t" or as "s", but I have never had problems with it. Then again, I went to an International School for the first seven years of my education life, so that might have something to do with it. I can't remember if I ever had problems with it, though.
With regards to other consonant clusters, I don't really know. If the people I know have problems, then it isn't as glaringly obvious as with "th", I guess. There are a few other, very popular wrong pronounciations, such as "country" spoken with "a-u" instead of "cuntry" (that looks wrong!
:), but nothing that ties in with the consonant clusters you were asking about.