I listened to the presenation today given by Oleg and there was one slide in there that showed 4 different sizes of Thumbnails. I thought I read somewhere that server would generate a thumbnail exactly for that size of the field on the layout.
But after seeing the presentation today I think that might be different. It looks like the server might be generating 4 possible sizes to be used instead. But maybe that was just a slide showing that it can generate different sizes.
So my question is does it generate custom thumbnails or does it generate the next smallest one? I would probably think it genrates the next closest one. But not sure.