I suggest watching http://www.youtube.com/watch?v=BB3hXrW_jz8
to get timings and such.

intro - slow build up:
Brenden starts by plucking and building up to a G chord While Jake plays some harmonics 
that i can't quite make out.
----------------------------------------------------|
----------------------8-8-8-------------8-8-8-8-8-8-|
7-7-7-7-7-7-7-7-7-7-7-7-7-7--7-7-7-7-7--7-7-7-7-7-7-|
----------------5-5-5-5-5-5--4-4-4-4-4--8-8-8-8-8-8-|
----------------------------------------------------|
----------------------------------------------------|
G-Gm-d
This part is pretty easy.  Brenden strums a G, Gm, D (sometimes standard d, sometimes a 
power chord with a B bass note on the 6th string) while Jake lays a reverse arpeggio on 
the G and G minor something like this:

---------------------------------------------|
3--------3-----------------------------------|
--4--------3-------7-------------------------|
----5--------5-----7-------------------------|
------5--------5---5-------------------------|
---------------------------------------------|

That's the basis of the intro/chrous parts.  Jake does a lot of improv, particularly 
around the D chord in the chorus chords.

During the verses Brenden plays some arpeggio around the following chord forms

D (xx0232@1)     Bb/Gm           G2-------0----3-------0----3----| (320003@1)3-------3----3-------3----3----|
2-------0-OR-0-------0-or-0----|
--------0----0-------0----0----|
--------1----1-------x----x----|
---------------------3----3----|

The first couple of verses are just Joel playing keys, but if you are playing on an 
acoustic by yourself you can play as well:

D (xx0232@1)     Bb/Gm       GI (320003@1)hope its true but ill make due with
                    D (xx0232@1)      Bb/Gm           Gthe (320003@1)things that i have heard
        D (xx0232@1)      Bb/Gm     Gso (320003@1)if i do this right then i might
             D (xx0232@1)      Bb/Gm           Gget (320003@1)what i deserve

D (xx0232@1)   Bb/Gm   G (320003@1)                    D (xx0232@1)      Bb/Gm           Gthis (320003@1)tattoo that i outgrew i never thought it through before like you i
                D (xx0232@1)      Bb/Gm   Gwish (320003@1)somehow i knew to listen to my
                      D (xx0232@1)      Bb/Gm           Gmissing (320003@1)voice of reason

D (xx0232@1)      Bb/Gm           Gwhat (320003@1)would it take don't make me beg i'm
                    D (xx0232@1)      Bb/Gm
falling on my knees

G (320003@1)     Gm (355333@1)                  D (xx0232@1)  can't you stick around and tigthen
     G (320003@1)   Gm (355333@1)   Dloose (xx0232@1)ends for me
G (320003@1)     Gm (355333@1)                  Dit's (xx0232@1)not too difficult to tighten
     G (320003@1)   Gmloose (355333@1)ends

D (xx0232@1)   Bb/Gm   GD     Bb/Gm   G (320003@1)D (xx0232@1)  Bb/Gm   G (320003@1)                          D (xx0232@1)   Bb/Gm   GYou (320003@1)read the story till im bored with the facts i can't ignore

D (xx0232@1)   Bb/Gm   G (320003@1)       D (xx0232@1)      Bb/Gm     Gso (320003@1)if society reflects on me and i don't like the things i see there's

D (xx0232@1)   Bb/Gm   G (320003@1)                           D (xx0232@1)   Bb/Gm   Gno (320003@1)re-writing peace bound dreams we believe in

G (320003@1)     Gm (355333@1)                  D (xx0232@1)  can't you stick around and tigthen
     G (320003@1)   Gm (355333@1)   Dloose (xx0232@1)ends for me
G (320003@1)     Gm (355333@1)                  Dit's (xx0232@1)not too difficult to tighten
     G (320003@1)   Gm (355333@1)  Dloose (xx0232@1)ends

The Chorus chords continue until the end