Hi guys, new here so go easy

I have 2 tables in a Joomla database

User table
Items table

The items table contains short stories written by users. The stories are held in the items table

I need a query that contains one line for each user with the total number of stories they have written

Code:
 select u.username, i.title, i.created, count(i.id) as totalstories from jos_k2_items i inner join jos_users u on u.id = i.created_by group by u.username asc order by u.username, i.id desc
Results returned like this
Username Title, created, totalstories
User A My story 23/05/2010 25
User B Another story 16/09/2010 17

The aggreagate part works fine

The problem I have is that each user will have a number of stories eg 25 but we are only showing one line per user as a summary

I need it to show the last item (story) created by the user and the last create date and the query currently returns the first even if I put the story id as desc sort order.

I'm sure it's something obvious so any help gratefully appreciated!

Many thanks

Mark