Before I jump into telling you how cool the htmLawed module is, let me start by stressing how important it is to get the input formats configured right on your Drupal website.

From a UI standpoint, its confusing for users when they are presented with the 'input format' tab underneath textarea fields on node submission forms - if they don't need to see them, the way to get rid of them is to just allow anonymous & registered users to use a single/default format.  Normally I recommend that being full html with a link filter to auto-code email and html links; of course, this should be done in cahoots with a wysiwyg editor, otherwise your users would have to enter html tags to format their posts.

Now, a downside to letting folks use full html is that wysiwyg editors normally don't do a great job of writing html in the way that you want....  read more »