I want to build a wikipedia type information system,
http://en.wikipedia.org/wiki/Main_Page Like this but with a much more limited information set.
Im not sure how I should build the tables around the data for:

The Main Content - Are these Subdivided portions linked through foreign keys?
Images - Movie Files etc - Should I build a separate table for these types of items (varchar link to file), or can I store the information as blob or something directly into the record

Field Data type Description
TopicID Int PK Primary Identifier
Parent_TopicID Int FK Link to Parent Category
Topic Varchar(120) Name of Topic
Information varchar(unlimited????)

would appreciate any thoughts on the matter, and Im using SQL server 2005 for any data types.

why do this at all? there are so many free wiki packages out there already. why not just use one of them?

Another way of putting this: what do you need that the existing packages don't offer?

Whats a Good example?, I already have an extensive CMS that I want to add another facet of information too,

I cant' afford a commercial option and don't want the typically external links that come with the free editions of software.
Im not sure what features are offered by existing systems?