I just updated the Grammar and Word Usage Round-Up post over on the writing related tab.
Newest additions:
– affect vs. effect – losses vs. loses vs. looses – retch vs. wretch – horse vs. hoarse – breath vs. breathe vs. breadth – coarse vs. course – cord vs. chord – tick vs. tic – eke vs. eekFunny story? I literally (and I do mean literally) woke up the other night worried that I had misused coarse for course in a post last week. It’s kind of sad, to be honest. But true. (I was not, however, so concerned by it that I checked the post the next morning. So, it’s quite possible that a post from last week uses coarse for course. Sorry ’bout that.)
Also, I constantly second guess myself on my uses of breath and breathe. I do not know why I have such an issue with that one. Same with desert vs. dessert. I always have to think about those ones.
M.H. Lee 
Are the words really confused? Or are we projecting society’s assumptions onto them, so the words seem to be troubled? When will we realise that if each person has a unique perspective, then each word must hold a world!
On a less whimsical note, I worry about misuse of homonyms too. I even worry when they are not misused; I spent over an hour on Sunday worried I used “mould” instead of “mold” to describe a vessel for casting.
The life of a writer!