Please do not reply to a message then completely change the subject.  If you 
thread messages, which is very common with mailing lists, then your brand new 
message ends up under a completely different thread.  Just because you change 
the subject line, does not change the thread.  The thread is tracked in the 
header of each message.

The converse of this is also true.  Please try to reply to messages in the 
thread to which you are replying, so that it all sorts out correctly.

Just a little thing, but really helps make the mailing list more readable.  
If your mail program does not handle the threaded messages feature, it's time 
you tried a new mail program.  Kmail works great.  Even Netscape handles 
threaded messages flawlessly.  I'm sure there are many others.

Thanks for your consideration,
Jim Herrmann

P.S. HTML is also bad form on a mailing list.