I have recently upgraded the site from Drupal 5 to Drupal 6. This was no simple task given the level of API changes that occurred between releases.
Note to Drupal community: If you want to be taken seriously in the 'enterprise' world you need to be backwards compatible with third-party modules. Forcing everyone to completely rebuild their modules and sites every year is not a viable option.
Anyhow I use the TinyMCE module for writing posts but do not like the default way it takes up half the textarea window with wasted grey space (see below):
To get around this problem edit the modules/tinymce/tinymce.module file and change the line that reads:
$min_btns = 5; // Minimum number of buttons per row.
To something more sensible like:
$min_btns = 30; // Minimum number of buttons per row.
This will give you an editor that is far more space efficient and better looking: