List Types & List Internal ID available within MOSS 2007
Ref: http://vspug.com/bobbyhabib/2007/09/26/list-types-amp-list-internal-values-available-in-moss-2007/
The following lists the default lists types and their internal sharepoint ID available in MOSS 2007. This references list can prove to be handy when creating your own Site Definitions, List Definitions and for Event Handlers:
Value Description
100 Generic List
101 Document Library
102 Survey
103 Links List
104 Announcement List
105 ContactsList
106 Events List
107 Tasks List
108 Discussion Board
109 Picture Library
110 Data Sources
111 Site Template Gallery
113 Web Part Gallery
114 List Template Gallery
115 XML Form Library
120 Custom Grid for a List
200 Meeting Series List
201 Meeting Agenda List
202 Meeting Attendees List
204 Meeting Decisions List
207 Meeting Objectives List
210 Meeting Text Box
211 Meeting things To Bring List
212 Meeting Workspace Pages List
300 Portal Sites List
1100 Issues Tracking
2002 Personal Document Library
2003 Private Document Library
One of the interesting points in the above list is the lack of numbering. You may have noted that 112 is not in the above list for example. But if you go to any Site Setting page within a MOSS site and in the Site Actions option click People & Group which takes you to a page that displays users and groups. Right hand click this page and view HTML source on this page. Schroll down to the bottom of the page and what you will notice is a hidden object in the HTML referencing the ListTemplate ID that displays the value of 112. INTERESTING! 
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From MSDN (http://msdn.microsoft.com/en-us/library/ms462947.aspx)
Optional Integer. Provides a unique identifier for the template. This identifier must be unique within the feature, but need not be unique across all feature definitions or site definitions. The following table lists values for the default list template types.
100 Generic list
101 Document library
102 Survey
103 Links list
104 Announcements list
105 Contacts list
106 Events list
107 Tasks list
108 Discussion board
109 Picture library
110 Data sources
111 Site template gallery
112 User Information list
113 Web Part gallery
114 List template gallery
115 XML Form library
116 Master pages gallery
117 No-Code Workflows
118 Custom Workflow Process
119 Wiki Page library
120 Custom grid for a list
130 Data Connection library
140 Workflow History
150 Gantt Tasks list
200 Meeting Series list
201 Meeting Agenda list
202 Meeting Attendees list
204 Meeting Decisions list
207 Meeting Objectives list
210 Meeting text box
211 Meeting Things To Bring list
212 Meeting Workspace Pages list
301 Blog Posts list
302 Blog Comments list
303 Blog Categories list
1100 Issue tracking
1200 Administrator tasks list
This attribute corresponds to the Type attribute of the List element.
