Great comparison, thank you!
It's especially interesting for me as I bought a PS3 yesterday.
I noticed that the PS Store doesn't seem to offer the option to access and browse ALL demos and other free stuff (such as some designs/wallpapers/characters). Maybe I just didn't find the option, but at least a search for the word "demo" worked.
Also it seems that unlike the Wii Shop Channel the PS Store doesn't tell you that you've already downloaded a specific game or file. I wonder if an accidental 2nd download of the same file just overwrites the existing one or saves it as a 2nd file.
One more thing: Flower is great! After having played the first "level" it's already among my most favorite games of the year.











