The following table lists the major features of Dragon NaturallySpeaking, and indicates which editions contain those features.  The first table highlights the version 3 family of Dragon NaturallySpeaking (and Point & Speak).
 
PS = Dragon Point & Speak
TN = Dragon NaturallySpeaking for Teens
SE = Dragon NaturallySpeaking Standard 3.52
PE = Dragon NaturallySpeaking Preferred 3.52
MO = Dragon NaturallySpeaking Mobile
PR = Dragon NaturallySpeaking Profession 3.52
ML = Dragon NaturallySpeaking Medical or Legal Suite 3.52

Edition Comparison (Version 3.5 Family)

 PS TN SE PE MO PR ML  
  X  X  X  X  X  X  X    Support for multiple users
  X  X  X  X  X  X  X    Direct dictation into most applications (NaturalText)
        X  X  X  X  X    Dragon NaturallySpeaking's own editor
        X  X  X  X  X    High accuracy models and vocabularies (BestMatch)
     X                   Speech models and vocabularies optimized for teens
     X  X  X  X  X  X    Command and control of the desktop
     1  X  X  X  X  X    Dictation with Select-and-Say in other applications (see list)
     2  X  X  X  X  X    Integration with Word 97 and WordPerfect 8 (NaturalWord)
        X  X  X  X  X    Natural language commands for Word 97
        X  X  X  X  X    Mouse and keyboard control by voice
           X  X  X  X    Text to speech playback
           X  X  X  X    Playback of recorded speech
           X  X  X  X    Support for digital and analog recorders (NaturallyMobile)
              X          Bundled with Drgaon NaturallyMobile digital recorder
                 X  X    User programmable command and control     (macros)
                 X  X    Support for multiple topics
                 X  X    Optional 64,000 word vocabulary size
                 X  X    Includes a copy of Corel WordPerfect Suite 8
                    3      Base vocabulary optimized for medical (or legal) topics

(1) Version 3.52 and the Teens Edition currently support dictation with complete voice correction in the following applications (in addition to Word 97 and WordPerfect 8): Microsoft Outlook 97, Microsoft Outlook 98, Wordpad, Notepad, Microsoft Chat 2.1, Microsoft Chat 2.5 and NaturallySpeaking dialogs themselves.

(2) Unlike in the other editions, in the Teens Edition no menu items or toolbar icons are added to Microsoft Word 97 or Corel WordPerfect 8.

(3) The Medical Suite contains a medical vocabulary, the Legal Suite contains a legal vocabulary.

Version Comparison

The following table illustrates which features are available in the various versions.  For simplicity, I only list the Professional Edition.  This makes it clear when features were added to the various versions.
 
10 = Dragon NaturallySpeaking Personal 1.0
20 = Dragon NaturallySpeaking Deluxe 2.02
30 = Dragon NaturallySpeaking Profession 3.0 (renamed from Deluxe)
35 = Dragon NaturallySpeaking Profession 3.52

 10 20 30 35 
  X  X  X  X    Dragon NaturallySpeaking's own editor
  X  X  X  X    Select-and-Say editing
     X  X  X    Support for multiple users
     X  X  X    Direct dictation into most applications (NaturalText)
        X  X    High accuracy models and vocabularies (BestMatch)
     X  X  X    Integration with Microsoft Word 97 (NaturalWord)
        X  X    Integration with Corel WordPerfect 8 (NaturalWord)
        X  X    Natural language commands for Microsoft Word 97
     X  X  X    Mouse and keyboard control by voice
     X  X  X    Text to speech playback
     X  X  X    Playback of recorded speech
        X  X    Support for digital and analog recorders (NaturallyMobile)
     X  X  X    User programmable command and control     (macros)
     X  X  X    Support for multiple topics
     X  X  X    Optional 64,000 word vocabulary size
     X  X      Includes a copy of DDWin 3.0
        X  X    Includes a copy of Corel WordPerfect Suite 8
           X    Number, currency and web address formatting
           X    Command and control of the desktop
           X    Menu and dialog box control in Microsoft Word
           X    Select 'n' say into other applications

Here are the descriptions of some of the new features which were added in the Teens Edition or in Version 3.5:
 
What is Number and Currency Formatting?
Command and Control of the Desktop
Select 'n' Say Editing in Other Applications
Active Accessibility Support for Microsoft Word
What Commands are New in Version 3.5?
 
Here are the descriptions of some of the new features which were added in Version 3.0:
 
What is BestMatch Technology?
What is NaturallyMobile?
What are the New Correction Commands?
What is the New User Wizard?
What are Natural Language Commands?
What are the New Scripting Language Commands?
What are the New Keyboard Commands?

Here are the descriptions of some of the more obscure features which were added in Version 2.0:
 
What is Multi-user Support?
What is Multi-Topic Support?
What are the Larger Vocabulary Sizes?
How is Text to Speech Integrated?
What is Playback of Recorded Speech?
What are Command and Control Macros?
How Can You Control the Mouse by Voice?
What Is the Expanded Options Dialog?
What Enrollment Text Was Added in Version 2.02?