Hi,

The image tags in these messages point to the attachment
MIME boundary. Currently Gossamer Mail does not know what
to do with this so it ends up as a broken image. It is
however possible to make the image show up and I had planed
this for the next version (which will hopefully be released
in beta soon :)).
As for sorting with new messages on top, I had thought this
was the default behavior. You can click on the Date field
link when viewing messages and this should achieve this.

Cheers,

Scott