Loosely named after Terry Pratchett's character in the Discworld series of novels. The Luggage can hold anything its owner needs, and can follow him/her anywhere.
This is still a very sketchy idea, but here is the use case that is behind.
At work, many people are used to taking notes in their personal notebook (the paper form, not the computer form). I find this suboptimal, and have installed mediawiki on my personal laptop for this usage. But as much as I love mediawiki for a collaborative wiki, this solution is over the top for a personal usage.
There are a number of tools out there, but:
Rekollect comes close, but as far as I could tell, is not based on a wiki philosophy.