The DNN text editor also contains a nifty little spell checker. It is a tool that works in IE and needs to be installed on your local machine first. Once installed, it works like a breeze and helps avoiding most typing mistakes (it will not improve my English).

I recently found out that you can add a Dutch dictionary (Google on: 'ieSpell dutchdictionary' and you will find it). In the spell checker dialog you can add a new dictionary under 'Options...'. You can also make it your default language.