I’ve just been alerted by my colleague Kyle Harvie to a Visual Studio 2010 add-in that should prove very useful if you are an SSDT user. Its simply called Highlight all occurrences of selected word and does exactly what it says on the tin, you highlight a word and it shows all other occurrences of that word in your script:

There’s a limitation for .sql files (which I have reported) where the highlighting doesn’t work if the word is wrapped in square brackets but what the heck, its free, it takes about ten seconds to install….install it already!
@Jamiet