fuzzknuckle: The price for this is all over the board. Steam has it for $20, GMG for $25... Amazon, however, has had it on sale for under $3 for over a week, and shows a regular price of $7. GamersGate has it listed at $6.95, not on sale.
I too "feel" that this title is overpriced at anything above $10. Of course, GOG offers goodies and is DRM-free. But still.
Full disclosure: I have not played this game. It doesn't really appeal to me, but looks more like it should be a movie than a game. If it were a movie, I might watch it with my kids, who knows.
Gamersgate gives me a price of 9,95€ rather than $6,95. GOG's standard price is somewhere between 11-12€ and it's the second best price I have seen, so I wouldn't call it overpriced. DVD version is between 19,90€ and 28,90€ in my local stores. And considering that I bought this game from GOG sale, I think I got the best deal there is.
Also I want to point out that this is a really nice adventure game and I have paid a lot more for much worse adventure games. The Whispered World has better plot and puzzles than many other recent adventure games.