It currently sorts by ascending call number and you can't change it and it's quite annoying - I noticed at the user day, when Nano was being demoed you kept clicking on the column header to re-order every time as well :-).

It also doesn't remember the column widths you set, but I guess this is due to the fact it auto-resizes to fit the current screen size (which we like by the way), but often the Call Number and Logged Date columns are taking up loads of blank space, but the Description field is then quite narrow and you can't read much of it