I am a fan of joomla and I think it is great for cms websites, but some ready obvious functionality seems to escape it.
I was trying to make a link from text in one article to another article and found it possible to do within the editor.
If you have search friendly urls turned on it even get more messy,
1. Create a new menu under the menu manager and call it hidden menu.
2. Add a menu to it and select the article you want to link to. then copy the alias.
3. Open the article and select the text that you want the link attached to and select the add link paste the alias in to the link text field and save.
Now that is one long way of linking to a new article (Lads we need a bit of work put into this short fall)