Probably a) no-one wants to do these things for free (I know I dont') b) RISC OS has a very limited toolkit to work with, particularly under C++, which I expect KHTML is based on (could be wrong here), and c) lots of RISC OS coders have gone elsewhere, it's not the platform it was for attracting programmers.
Nodoid, agree with what you're saying, but do you mean 1.6K?
But it's true, RISC OS does not have a monopoly on good UI, and certainly not on good software. The price drop is crucial, because RISC OS does not have the means to be a person's only computer any more, and the user is more likely to have an Acorn and something else, and therefore cannot afford (say) £700 for a PC, and £1300 for an Iyonix.
That would be a good poll actually, who *only* uses RISC OS?