So, if you are using DotNetNuke 5.4.1 you already have a cool alternative to default text html editor. Yes i am talking about Telerik RAD Editor. It replaces old FCK editor with new cool menus and great features.
If you are ready, magic trick comes for those people :)
All you have to do is simply finding following line in web.config.
<htmlEditor defaultProvider="FckHtmlEditorProvider">
And change it to following line:
<htmlEditor defaultProvider="TelerikEditorProvider">