Stephan Hradek's growing catalogue of tips, tutorials, and other resources. Stephan has also developed several plugins and macros that you can find at http://tiddlystuff.tiddlyspot.com/.
http://tw5magick.tiddlyspot.com/
Some things in TiddlyWiki seem like Magic. As my preferred nick is Skeeve, I felt that TW5 Magick is a proper name for this collection of some of the "magic" tricks one can do with TiddlyWiki.