[support] Highlighting the blog author's comments in a blog

[Tim Vaughan]

It's becoming more common for blogs to have their author's comments
highlighted in the comments after a post (I was reminded of this while
viewing Brian Jones's blog on Open XML - see
http://blogs.msdn.com/brian_jones/archive/2007/01/19/passing-the-openxml-standard-over-to-iso.aspx#comments
for an example).

How can I do this in Drupal?  My guess is that is requires some PHP in
template.php plus an extra bit of css but I'm not sure of the best way
to get this done.

Thanks in advance,

Tim