I have created a virtual filesystem for USENET news (“VFNews”) under QNX 4, but I haven't ported it to QNX Neutrino.
I'll describe what VFNews does and how it works. Most news services these days are all NNTP-based high-speed article-at-a-time services, rather than the traditional bulk systems that they used to be up until the mid 1990s, so the actual end-product is of limited interest. However, you'll see an interesting way of increasing the efficiency of a processing method by several orders of magnitude.