An introduction to DTrace + collection of DTrace scripts to learn from:
http://brendangregg.com/dtrace.html

Another intro: 
http://www.princeton.edu/~unix/Solaris/troubleshoot/dtrace.html

DTraceToolkit (a collection of advanced scripts)
http://www.nbl.fi/~nbl97/solaris/dtrace/index.html
|
Presentation:
http://www.nbl.fi/~nbl97/solaris/dtrace/dtt_present.pdf


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When tired of tutorials, in doubt, or looking for a particular 
DTrace built-in variable or function, go to the definitive
reference:

"Solaris Dynamic Tracing Guide"
http://docs.oracle.com/cd/E19253-01/817-6223/index.html

Alphabetical Index:
http://docs.oracle.com/cd/E19253-01/817-6223/idx/index.html

D Scripts from the DTrace Book:
http://www.dtracebook.com/index.php/Main_Page (Esp.
   scripts in http://www.dtracebook.com/index.php/Kernel)  

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Excellent slides from a course taught by Jakub Jermář and Martin Děcký
at the Karlov University of Prague:

http://d3s.mff.cuni.cz/teaching/crash_dump_analysis/slides/05-solaris.pdf
http://d3s.mff.cuni.cz/teaching/crash_dump_analysis/slides/06-mdb.pdf

Also:
http://d3s.mff.cuni.cz/teaching/crash_dump_analysis/slides/02-ia32.pdf
http://d3s.mff.cuni.cz/teaching/crash_dump_analysis/slides/03-amd64.pdf