Tobias,
OK.... I think I was rather slack on my communications skills today :(
In many workshops I've attended sticky "Post-it" notes are often used in so called "brainstorming sessions" to facilitate "creativity" in groups.
TW is perhaps more associated with the index card. The popularity of index cards was greatly enhanced by David Allen's GTD and the "Hipster PDA [2]". MonkeyGTD uses the hipster PDA in its logo [3]
While index cards are for my money, way cooler than Post-it notes, they are used to promote organisations,along with other stationary items: pens, mouse mats, mugs. The market caters for organisations who with to give away pads of Post-it notes emblazoned with logos, strap-lines and other marketing paraphernalia. Today, I have been using some kindly given away by a university.
The Post-it has the advantages over the index card in that it can be stuck to a wall and grouped. It's part of the everyday business paraphernalia - everyone knows what they are.
TiddlyWiki is not a company, so it doesn't have a budget to promote itself using these kind of items, but TW users could buy TW post-its for their own use, in workshops (if they were running them) for the purpose of promoting TW. One could print the TW poster (or a variant of it), put it on the wall of a room being used for a "brainstorming" session. After the brainstorming session, the Post-its would be used to populate a TW which would then be shared amongst the participants. Some of the Post-it pads might go missing, just like the ones I was using today.
I was also thinking about Ketso [4] only something based on TW and Post-its... where paper and technology come together. Just as Ketso has a methodology and a brand, a product / use case could come out of TW. It would be one of a suite of use cases TW, uses which could join together. For example a group workshop's data have a GTD tool bolted on, or a TW Scholar tools.
The use case would not be a full blown wiki, but rather one which would be used by a facilitator. A pack could be offered to faciliators and part of that pack could be a set of Post-its designed for integration with a particular TW. While folk may not want to pay for TW itself, they may buy some branded Post-its - especially if they thought the profits would initiatives to validate TW use as a serious tool used by serious people...
The output of the workshop could be something similar to TW.com, where changes are proposed on GitHub
best wishes
Alex