Lots of dots, maybe even Morse code. However the page on Microsoft Office Online gives a great overview of the various features that are available for the different levels of SharePoint Technologies sets.
From the site you should be able to find the right combination of what you need to solve a particular business problem and make a well informed decision to choose between:
A small subset of the goodness on the page linked in this post (Hint, for the full details, try the link)
Microsoft SharePoint Server 2007 Edition Comparison - Products - Microsoft Office Online