My boss found a misspelling on our website yesterday.
So, I thought I'd look around for a Visual Studio.NET 2005 spell checker addin.
I found the following tools... Spell Checker for VS.NET 2005 Version 1.0 Add-in by Dean J. Giovanelli and Spell Checker for HTML and ASP.NET pages by Mikhail Arkhipov
The tools have a lot of settings so they don't spell check things you aren't concerned about.
Using one of the above tools I was able to find the spelling mistake and correct it. I hope you find the above tools useful as well.