Valuble site: Commonly Confused Characters
http://www.cs.sfu.ca/~ggbaker/reference/characters/28th of December 2004
Found this site when I was trying to figure out the HTML entity codes for certain characters that had slipped into my XML file.
It cleverly explains how they are used, their unicode number, the HTML entity, how to write in in TeX and a link explaining more about each commonly confused character.
Well done Greg Baker
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