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I've kicked that thread up and also linked to this one. What I'm seeing is snippets when ODP descriptions aren't present. The snippets seem to break at sentence breaks, which sometimes makes them pretty irrelevant.
Basically, I'm seeing the same thing, though for some sites I'm seeing descriptions that are shorter. By breaking at sentence breaks, they are usually complete sentences, which I find less satisfying, not more, than shorter snippets. You get a whole sentence, but it's often not really what the site is about... and the uninformed surfer probably won't know it's an excerpt.
None of my sites/pages have ODP listings, so I can't comment on that.
This is a very recent change... less than a week or so old.
The site isn't in PFI, it looks like a directory description, but isn't any ODP/Yahoo/Looksmart incarnation i can find, and it's not in ALT tags, not in content or meta like this at all - and the site only has two truly spiderable pages (the rest is dynamic parameter mess).
Google snippets at least vary with, and often reflect the query, but it seems like Ink just pulls some random text. Sometimes it is from the top of the page and sometimes from a few different places on the page.