Innovative stamp issues

It is clear that philately has not remained still in face of social and technological developments. The first pop-up stamp in the world, issued by the Netherlands in September 2012 was a good example. The stamp was issued for the children book's week, and uses a cardboard slider to do the trick. For stamp fans that means a way of engaging children in the philatelic world, as well as being an interesting reading incentive, as it can be combined with a book.
Further on modern stamps, some post offices seem to be trying to engage the population in its issues. One recent example is the Swiss Post, which is lauching this year (in March) the portrait of 111 Swiss, an issue to be called the "Faces of Switzerland" and is an attempt to merge traditional products with "the digital world" (source: www.post.ch/) , as people have the chance to upload their picture on the website.
When talking about modern stamps, however, I cannot leave out the Belgium chocolate-tasting stamp to be issued this year. Not only shall they taste like chocolate when licked, but shall have the sweet's aroma! Belgium will also still this year issue a stamp that glows in the dark for a road safety theme, and wishes to celebrate its Royal Metereological Institute's 100 years anniversary wish a stamp issue containing heat-sensitive ink (when touched, a pattern shall show itself on the background!). This news that I read on The Telegraph (www.telegraph.co.uk/), states philatelists are not showing such enthusiasm. 
Well, I welcome innovation on stamps, especially as these may be incentives to younger people to taste the world of stamps (and in the Belgium issue the tasting may be quite literal). What do you think?

August 2015 addition to this post:
The "Faces of Switzerland" stamp in the picture bellow: