[zem]

yep, "mousehole". it was used to effectively add a hidden comment section to random pages.

[hencq]

I remember that too, but I thought it was called hoodwinked or something close to that.

[lazyatom]

IIRC, mousehole was an alternative DNS system, and hoodwink'd was the hidden-content-layered-on-existing-websites.

[dav]

ah, yes! hoodwink.d rings a bell