|--------------------------------|---------------------------------------|
|--------------------------------|----------------------------------8----|
|--------------------------------|----------------------------------7----|
|--------------------------------|----------------------------------6----|
|--------------------------------|----------------------------------7----|
|--2p0--0--0--0--0--0--0--3--5---|--2p0--0--0--0--0--0--0--0--0--0-------|
The next part, I could have continued with the E pedal or a different
type of riff, but I opted for some chords.
     Csus         Em          Csus         Em      D       C       Bm
|----0------|----0--------|---0-------|----7---7-------------------2----|
|----3------|----0--------|---3-------|----8---8---7---7---5-------3----|
|----0------|----0--------|---0-------|----9---9---7---7---5-------4----|
|----2------|----2--------|---2-------|----9---9---7---7---5-------4----|
|----3------|----2--------|---3-------|----7---7---5---5---3-------2----|
|-----------|----0--------|-----------|---------------------------------|
I like suspended chords, with a lot of distortion you get really nice
overtones and harmonics.  The last bar is just descending in the Em key.
When writing just chords, I recommend listening to drummers for different
types of strumming.  There's a book called 4/4 for drummers, and it's an
excellent reference for different types of patterns.  Rush is a great band
to listen to for strumming rhythms.  Especially the old stuff.  I try to
stay away from a lot of "chugging" and the ever typical heavy metal
downstroke rhythms.  Reggae is a good source as well, playing on the 
2nd and 4th beat, Rush uses this in "Vital Signs" from Moving Pictures.
Here's the main theme from Yngwie Malmsteen's "Heaven Tonight".  Notice
the guitar riff is the same as the vocal melody.  This is pretty basic
and straight forward, but it's a nice melody, and makes for a very
commercial song.  Yngwie opts for leaving off the root note, and leaving
that to his bassist.  The Keyboards are playing the same thing, and the
layered background vocals add to the hugeness of the melody.  Notice also,
that he uses the E note for "chugging on", makes the song a little 
heavier, since the rest of the part is melodic/commercial.
  E                        D                                C
|-----------------------------|---------------------------|--------------
|-----------------------------|---------------------------|--------------
|-9--------9--------9-----7---|----7~------7--7--7--------|-5--------5---
|-9--------9--------9-----7---|----7~------7--7--7--------|-5--------5---
|----7-----------7------------|---------------------------|--------------
|----0--0-----0--------0------|-0------0------------0--0--|----0--0------
     C        D                   D  A  D