Joomla Article Preview extension allows to preview an article before publishing, just select your favorite item menù for real article preview in plugin settings.
Create an article, set it to a temporary category and save it. It will appear a new Preview Button in the toolbar.
If all is ok set article to its right category and save.
download plg_article_preview_1.0.zip Joomla! 2.5 and 3.0 native