John R. Yamamoto-Wilson wrote:
>  There doesn't seem to be a way to 
> mark all messages as read, either...
> 

On the list of newsgroups on left pane, right-click on the newsgroup you 
want to mark as all messages read.

You'll get a box that pops up and the third option from the bottom is 
the one to mark the newsgroup read.

If you want to kill an individual thread (not have any of the 
current/future messages in the thread show up as "unread"), just type 
the letter "k" when viewing a message in the offending thread.  Hitting 
"k" again in the thread will turn off this feature, and allow the 
annoying posts to pile up unread.

-Jim