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The Blues Scale ishandy to know as it is used by
players like Eric Clapton and Kirk Hammet.
This is it explained simply.
We'll take the A minor Pentatonic as our example.
The A minor Pentatonic contains the notes
A C D E G
The A Blues Scale contains the notes
A C D Eb E G
Notice that they are both similar except 
the A Blues scale has an addtional Eb.  This is the 
basis of the Blues scale.  It's simply a pentatonic 
with a flat fifth.
To construct a Blues scale, simply find the flat fifth
of the root note and ad it in.  Here is an easy way to
find the flat fifth of a note:

A5
E|--------------------------------------------------
B|--------------------------------------------------
G|--------------------------------------------------
D|--------------------------------------------------
A|--7-----------------------------------------------
E|--5-----------------------------------------------

Above is an A5 powerchord.  See that it is a root (A)
And afifth (E).  The flat fifth is then obviously Eb.

Then see the A minor Pentaoonic:

E|----------------------------5--8--5---------------
B|----------------------5--8-----------8--5---------
G|-----------------5--7---------------------7--5----
D|------------5--7----------------------------------
A|-------5--7---------------------------------------
E|--5--8--------------------------------------------

E|--------------------------------------------------
B|--------------------------------------------------
G|--------------------------------------------------
D|--7--5--------------------------------------------
A|-------7--5---------------------------------------
E|------------8--5----------------------------------

To make the A Blues scale, simply add in the flat
fifth:

E|-----------------------------5--8--5--------------
B|------------------------5--8---------8--5---------
G|------------------5-7-8-------------------8-7-5---
D|-------------5--7---------------------------------
A|-------5-6-7--------------------------------------
E|--5--8--------------------------------------------

E|--------------------------------------------------
B|--------------------------------------------------
G|--------------------------------------------------
D|--7--5--------------------------------------------
A|-------7-6-5--------------------------------------
E|-------------8------------------------------------

From this, you can move this position around the 
fretboard.