I've always felt that we need to introduce more changes to spelling, but I have never imagined that there are so many systems that were never accepted.
First, I stumbled upon this: http://everything2.com/title/spelling+reform.
Then I felt that the ideas behind Wijk's Regularized English are very good, so I found this page: Notes on Wijk's Regularized English, and more generally, this page: List of Spelling Systems.
Just look at that list! Impressive.
Some of these are more than 100 years old...
Another interesting finding is Common Errors in English Usage.