You might have come across it already, but I think this is a neat idea, even if it is still imperfect or in Jeremy Ruston’s own words there is a skeleton in the closet: you cannot easily save changes to the wiki. (save the source of the page to a new textfile every time you close the wiki, and throw away the previous one)
I am currently testing Qumana a tool that hopes to offer a way of integrating all my browsing, both off and online and publishing (to multiple channels) into my workflow. TiddlyWiki appears to be taking a shot a this too, though in a different extremely leightweight way. Qumana, while pretty straightforward looks like it wants to be a more complete tool. TiddlyWiki at the moment is mostly a proof of concept than a useful tool, but it will be interesting to watch next steps.