I've talked about Tiddlywiki before, as I tried to use it extensively for my GTD approach for a wee while. It never really took off for me, the simplicity of text files is hard to replace.
However this morning I came across GTD Tiddlywiki plus, which is an adaption of Tiddlywiki aimed directly at being used for GTD functionality. It looks good, and might be enough to convince me to give it another shot.
Technorati tags: GTD, Tiddlywiki