Key to Tablature  
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B      - bend note slightly. Clutch does a lot of this.

B1/2   - bend up a half step

B1     - bend a whole step

PB     - pre-bend

R      - release note (from bend) 

These next 3 symbols appear on more recent tablature 
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1/2    - bend up a half step 
 )    

1      - bend a whole step  
)

(      - release note

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---    - hold bend when above staff (usually written out)

^      - hammer-on or pull-off, depending on the situation

.      - palm-mute

/ or \ - slide up/down

X      - fret-hand muting

TP     - tremolo pick

~~~    - vibrato

||      ||  
||O    O|| 
||      ||  - repeat notation in between these
||      ||
||O    O||
||      || 


And some special situations are marked with an asterisk.