I had a great Categories hack in b2 that gave a nested orderd list of all post by their categories. the founction call looked like this:
function list_cats_posts($optionall = 1, $all = 'All', $sort_column = 'ID', $sort_order = 'asc', $Ppos_sort_order = 'desc', $LowLimit = '0')
None of the currnt cat tags allow this. I wonder if someone can go on and add this feature.