I know it's not perfect, hence my qualifier "well, skeptic at least", but I figured some may be amused. There're a few bits of actual "let's investigate and see what happens", like what of the alien cow mutilation things, they basically observe a dead cow and wait for the "aliens" to see what actually causes the wounds... (Spoiler: it's not aliens. :))
Mystery Solved is more or less a webcomic about a gentleman adventurer/debunker.
I came across it earlier today and I figured some here might be amused.