Blog page that always displays most recent posts (from 3 categories)

Hi.

I need to setup a blog page that displays posts in chronological order, with the most recent at the top. The tricky part is, that I want to pull from 3 or 4 categories to accomplish this….

So, essentially the structure would look like this:

10:00 – Post 1 – Category 2
9:45 – Post 2 – Category 1
9:40 – Post 3 – Category 2
9:30 – Post 4 – Category 3

Is there an easy way to accomplish this? Right now I am use a snippet like this, which does not support multiple categories….

<?php query_posts(‘category_name=catname&showposts=3’); ?>

Any ideas?

Thanks!