As imagined in TiddlyWeb, a tiddler is a piece of content (//any// kind of content) with a title, a bag, a small number of pre-defined attributes, and zero to many key value pairs. In a very real way a tiddler on the web is a mildly enriched //anything// on the web. A resource with improved affordances.
A tiddler can still be a wiki page, or it can be a program, or an image, or a complex data structure. With a properly configured Storage Interface that data structure can be indexed, thus making TiddlyWeb an able member of the NoSQL crowd (of the document oriented ilk).
You get the web, plus you get storage, editing, access control, a common format, serializations, and extensive tools.