section - x-symbol & indentation problem

Hello,

If I use something like
   \section{Introduction}
then the Introduction is shown as highlighted and in large font, but the 
text in the section is not indented.

But, if I use \begin{section}{introduction} ...\end{section} everything 
is indented but the section name is not highlighted and shown in large 
fonts.

Which of these two options should I use? Which one is preferred style?
And is it some bug(or absence of feature) in auctex or x-symbol or am I 
missing something?

Thanks.

-- 
Surendra Singhi
www.public.asu.edu/~sksinghi/

"O thou my friend! The prosperity of Crime is like unto the lightning, 
whose traitorous brilliancies embellish the atmosphere but for an 
instant, in order to hurl into death's very depths the luckless one they 
have dazzled." -- Marquis de Sade