I've improved the Grammar tool by adding a favorite manager. When you are member of the site, a star is displayed next to each article. Simply click it to add / remove the article to your personal list.

That way, you can easily and quickly find an article you were interested in!

The grammar guide is also available publicly now. Put in other words, even if you are not a member yet, you can still read the content. But of course you won't be able to manage your favorites.