1: Icons for prefixes
I don't really know if this is possible but i have not seen any xf forums that use it. Would be cool if one could chose to put a small icon inside prefixes, and it should of course be different icon for each prefix.
2. Thumbnail on hover preview
Why not show a small thumbnail of the first attachment, or the first embedded image, when users hover the topics in the topics list. Right now you just get the image tag if there are images present.
This forum looks so awesome, I just think that these two things could make the difference for me.
So like my post if you too think that these things are needed in the 1.1 final.