I am seeing more JumpTo options within the serps this week in the UK, currently the number one position includes a "jumpto" option within the description to take the viewer to the particular part of the page their search relates to.
Obviously this is good for the searcher, not so good for the sites who use advertising or Adsense for income.
Thanks for the observation. This kind of linking within the snippet was something we saw a lot of right when rich snippets were first launched and then it kind of dwindled - at least it stopped being an item of comment here.
Did you take a closer look at any of the jump-to links you noticed? I'm wondering if the sites involved were using specific ID names for the elements that were the target of the jump-to links, or if Google is somehow creating something more sophisticated than that. At one point they were discussing some kind of overlay to achieve the same effect, but I didn't really understand the technical aspects well.