This plugin get all latest post truly ordered by date or by posting modified date. How this plugin works are: First, get all posts in last 30 days (by default). Then, all this post transformed as array data. We use posting date as key array. After that, we short this array data and ordered by the key (date). By this methode we can get truly latest post from entire blogs ordered by posting date or modified date.
Feature
Get truly all latest post from entire blogs
You can either ordered by posting date or by posting modified date
You can defined how much words that you like to appear as teaser.
You can either make your teaser clean from any html tag or not.
Get author name
Get author url
Get total post comments
Parameters
$start_from (integer): where array data start form.
$how_many (integer): how many array data are being to shorted.
$how_long_day (integer): time frame to choose recent posts from (in days).
$how_many_to_appear (integer): how many recent posts are being displayed.
how_many_words (integer): how many post's teaser are being displayed. Count by word. Default value are 50 words.
$clean_post (boolean): set true to remove any html tag within the post.
$short_by (string - post_date/post_modified): You can short the lattest post by positing date (post_date) or posting update (post_modified).

Return
ID
guid
post_title
post_content
author_url
author_name
post_date
post_time
comment_count


http://wpmudev.org/project/wordpress-mu-latest-posts