For me its way too hard to narrow it down to one, but here a few of my favs (which are changing all the time)
No more sorrow (live version)
Breaking the habit (demo of lpu9 and normal version)
New divide
QWERTY
A place for my head
Faint
The catalyst
I can’t pick my fav song in any album because they’re all good xD
my favs 5:
one step closer (reanimation version and original too)
numb
waiting for the end
no more sorrow
across the line
[quote=Mohammed]I can’t pick my fav song in any album because they’re all good xD
my favs 5:
one step closer (reanimation version and original too)
numb
waiting for the end
no more sorrow
across the line[/quote]
Like every song Lp make is awesome, dunno how they do it 
Hybrid Theory
Points of Authority
In The End
High Voltage
Meteora
Nobody’s Listening
Minutes to Midnight
No Roads Left
No More Sorrow
Hands Held High
A Thousand Suns
When They Come For Me
Blackout
Wretches and Kings
The Catalyst
Blackbirds
Iridescent
I didn’t really like BITS for awhile until I saw the video and It grew on me
There’s quite a few I like including One Step Closer, Pushing Me Away, Easier to Run etc. But my most favorite song is With You 
With you
One Step Closer
The Catalyst
My December
High Voltage (the One Step Closer Bonus version not the HTEP reissue version)
And One
Figure. 09
From The Inside
Crawling
Numb
Robot Boy
Leave out all the rest
No More Sorrow
Reading my Eyes
In Between
GIVEN UP
Leave Out All The Rest!!!
I love all LP songs, but this is definitly my favourite
Crawling
In the End
Leave all out the rest
Pushing me away
The Messanger
Blackout
Waiting for the end
Burning in the Skies
Iridescent … and many many more all LP Songs are great
dang, this is difficult.
I’d say crawling, my december, when they come for me and in the end.
no roads left is also captivating. oh mike shinoda’s voice.
My favourite LP song is definitely Figure.09…
Then, i have also to pick:
And One
My December
Crawling
Papercut
Breaking The Habit
Easier To Run
Faint
Given Up
The Catalyst
The Messenger
had to answer that question way too often
It’s a very tough question, but I must admit that “From The Inside” , especially the intro, gives me goose pimples everytime I listen to it. So, well, it’s probably one of my favourite ones, the tone ring on my cell phone for ages anyway [lol]
my fav songs:
[quote=Sergio-LP-19]my fav songs:
Nice!!!
Top 3:
Oooouh, that’s a tough one 
Can’t really decide which songs to pick but i’m giving it a try:
Qwerty
With You
A Place For My Head
Hands Held High
No Roads Left
In Between
Valentines Day
From the Inside
Wretches & Kings
The Messenger
Iridescent
I think this would be my all time favourites
[quote=B.L.A.C.K.]Oooouh, that’s a tough one
Can’t really decide which songs to pick but i’m giving it a try:
Qwerty
With You
A Place For My Head
Hands Held High
No Roads Left
In Between
Valentines Day
From the Inside
Wretches & Kings
The Messenger
Iridescent
Impressive choice!!!
I think this would be my all time favourites :-)[/quote]
BITS
JDL
Robot Boy
Faint
RME
and there will probably be some from the LPU 11 CD once I get a chance to listen more carefully to all of it.
Crawling
Easier to Run
Shadow of the Day
The Catalyst
No Roads Left