I was wondering if there is a way to store or view older versions of a tiddler and view, link, refer to them. Maybe there is a plugin to do this?
If you are referring to tiddlywiki 5 (the version from tiddlywiki.com) there is no plugin for versioning. But it wouldn't be hard to set up a versioning system using the clone button and some tags. This has come up recently on the google groups site and if you watch/ask there someone will probably make something to do versioning of some sort.