As I've probably mentioned before, one of my favorite superpowers is that of Stone Boy, of the Legion of Substitute Heroes. He did actually have the power to turn himself into an unmoving stone statue, but what I liked best about him was this exchange:
Chlorophyll Kid: I don't know how much good my powers would be at fighting crime and stuff out on my own.
Stone Boy: Right! How does this sound...? "Stop. Or I'll stand very, very still for a surprisingly long time!"
(I think that was an actual quote from a comic, but it might've been something someone on Usenet made up. Tom, I got the exact quote (as opposed to my inexact memory of it) from an old .sig file of yours; can you tell us if it was from a comic or not?)
Biking home the other day in the sunshine, I had a momentary thought that I'd like it to be sunny and warm all the time, instead of just most of the time. But of course for that to happen here in Mountain View would require all sorts of major climate changes, which would probably result in the deaths of ecosystems and humans. And I wouldn't actually want that.
So then it occurred to me that it would be even better to have the superpower of being able to feel that warm-sunlight-on-skin warmth at any time, regardless of circumstances. (Which I suppose could be achieved by taking drugs that would make me happy and calm and slow-moving, but "superpower" sounds so much more appealing than "drug," don't you think?)
Which got me thinking about the really minor superpowers that you rarely see in comic books. (Though I imagine many of them show up in comics like Top Ten, featuring places entirely populated by superheroes.) The kind of thing that would have no conceivable use in fighting crime, or even in rescuing people. Like the ability to turn your skin a uniform blue or green all over. (The ability to turn your skin a uniform red is, of course, a real-world superpower called "caucasian sunburn.") (Doesn't that sound like a lipstick color name?) Or the ability to detect loose change behind couch cushions. There was a comic book once (a one-shot, iIrc) about a guy who discovers he has the power to magically and instantly do anyone's dishes, and he sets forth in a homemade costume to Use His Powers For Good, with the sorts of wacky results you'd expect.
The Substitute Legion (follow Wikipedia link above) had other members with pretty minor powers; and for that matter, some of the regular Legion of Superheroes members' powers weren't much to write home about. Especially, as has been noted elsewhere, Matter-Eater Lad, who (like everyone from his planet) could eat his way through anything. A Captain Comics forum thread has some discussion about useful uses for minor powers.
I suppose it's all a matter of power levels. The solar-warmth power could be turned into a comic-book-level power by increasing the range, power level, and degree of control: first you'd get a character who could emanate warmth (no need for campfires, except for cooking purposes); then a character who could make everyone around them feel lazily nice (call her "Lassitude Lass," of course); then a character who can radiate higher levels of heat; then a pyrokinetic like Pyro; and then you end up with the Human Torch, able to throw fireballs and melt guns and completely control flame and even fly.
So I suppose another approach to coming up with very minor superpowers is to take existing superhero powers and turn them way way down. The Slightly Translucent Girl. Or someone whose skin is so tough it can't be pierced by anything less than a bursting firecracker. (Or so tough that he never cuts himself while shaving.) Or someone whose fingers can stretch by up to two inches. Etc.
So what are your favorite extremely minor superpowers? Feel free to make some up and post 'em here, or refer to ones that've already been published.
I'm especially interested in ones that you would actually like to have, but that are way too minor to be of significant use to anyone (except maybe yourself). But you can also post ones you wouldn't like to have, if you'd rather. Especially if you come up with something entertainingly silly.