I have tried to install Aspell without success and was beginning to despair of my content being spell checked when I realised there might be an easier solution. If you have the Google toolbar installed then there's a spell checker right there and it's quite good. Works fine in the html editor if you don't have aspell as this forum does (I've just checked this post).
Text editors
Aspell alternative
Denne diskusjonen har blitt stengt, og du kan derfor ikke svare i den lengre.