I know Bill..that what Ive tried first..
Finaly..upon my 20 min looking into php codes Ive font 2 ways to do it..
1) If you put <!--more--> in the post while writing it - it goes (more...) after publish
(use 'more' button)
2) if you need [...] on ALL already published posts on index (like in categories) you should replace the_content() in index.php template to the_excerpt() the you will see [...] after some ammount of lines...
still digging to see why the hell default the_content('Read the rest of this entry »') dont work in my index template...
these guys from wordpress 've done good job hidding usefull info

I bet many dont know of it
