In reply to captain paranoia:
> I'm a hillwalker, but I don't know what humps or Marilyns are.
As someone who has researched and written about this kind of stuff a fair bit over the years, I think HuMPs/Humps are far less widely known within the general hillbagging community than are Marilyns (and even those aren't as well known as the core Marilynbagging people sometimes seem to assume). Goodness knows how many people are actively bagging Humps, but it's not very many and most of them will have moved on from Marilynbagging in a postgrad kind of way.
To my eyes it appears (perhaps wrongly) that there's a sort of "list too far" boundary for a lot of people, and while Marilyns have come to be on the accepted, canonical side of the boundary, Humps - thus far at least - are on the outside. Beyond them are massive categories such as Tumps, Sims, Kirks and various others which effectively play the role of outer planets in the bagging solar system.
I'm pretty sure that the two most popular hill bagging lists in the UK - by some distance - are Munros and Wainwrights. Next perhaps come Corbetts and a composite of the various England/Wales 2000ers lists. Then probably a group containing Donalds, Grahams and Marilyns. County Tops / Council Tops have long been canonical in that there's a logic to doing them that extends beyond normal hillbagging mentalities, but they've never been very popular all the same.
Incidentally, this very day I was at a pleasant - both in terms of company and weather - gathering to mark a 1000th same-Marilyn ascent. This was by Lindsay Munro on Birnam Hill (which I think he said he first climbed in 1999) and neatly his wife Janet was climbing it for the 100th time. Lindsay's the third person known to have achieved the "triple crown" of 1000 Munros, 1000 different Marilyns and 1000 ascents of the same Marilyn - where the rule, such as this thing has rules, is that to avoid double-counting the 1000-ascent Marilyn has to be either a non-Munro or, if it is a Munro, the person needs to have racked up 1000 other Munros as well as the 1000-times one. If you see what I mean. (The first triple-crownee was Richard Wood.)