This question: Can I declare a different overlay specification in different beamer modes? just became "Popular" but it needs some help to get into canonical SE format.
Here is the history: I posted the question to StackOverflow way back when. Andrew and I wrestled with a few solutions, and I ended up accepting one of my own solutions. Six months later a user named "Gurvan" submitted an answer, which I didn't understand and dismissed as inoperable. Four months after that Gurvan came back and submitted another answer, which was really just a reiteration of the first answer, but with example code that demonstrated he was right. Shortly after that the question got migrated here.
Now I feel like Gurvan's answer (in its two parts) is probably the best one. Ideally his two answers should be one post, with the explanation and the sample code together. But Gurvan is nowhere to be seen. He has no TeX.SE account, nor as far as I can tell even a StackOverflow one.
Some options to proceed:
I edit his first answer, incorporating his second answer, and flag the second answer for deletion. The edits might end up being substantial, however.
Same as option 1 but with Gurvan's first answer marked as community wiki.
Continue the search for Gurvan and do nothing until we find him.
Other suggestions welcome.