Just a quick one this - you will probably find that when you use Tinymce and the standard Filtered HTML input format, all your text bunches up and doesn't break correctly.
Once solution to this is to use Full HTML - fine for the admin user but not so good for your average member of the great unwashed.
So, the solution is to goto admin/settings/filters and configure the "filtered HTML" filter. You then want to add <p> and <br> to the list of allowed tags.
Everything should now be lovely!