Ever since I have moved into developing web applications I have always tried to have a spell checker installed to check page text and comments/strings etc.
ComponentOne used to provide a nice free version which did the trick but since I had to rebuild kermit (my main work laptop) I found that they have started charging for it. So I started to have a quick look for a good free spell checker and I have settled on
ASP.NET/HTML Spell Checker for VS 2008.
It works based on Word dictionary integration and allows for custom words and exceptions and so does everything I need. Further details on where to grab it and how it works can be found here.