I first encountered this programmer several years ago when I downloaded and was awed by his Tofu application. For a very long time, I feared that Sagoo had abandoned the project, but today I was delighted to see that he has put out a new (2.0) version of that little eReading marvel.
In checking out the rest of his site, and some of his newer (freeware) software projects, I also found he's written some very insightful essays on the subject of interface design and usability. Definitely worth bookmarking for future reference...
Meanwhile, I've got to try to convince him to develop an iPhone version of Tofu. It puts similar eReader attempts like Stanza to shame!