If you are looking to get a pocketlogger to tune your DSM, go here www.pocketlogger.com
to buy the software and PDA.
Once you get to the pocketlogger startup menu, you have three choices; Datalog, View and Diagnostic.
Datalog is the most important one for tuning. The three main things you want to datalog are RPMs, Timing and O2 Sensor 1.
Go ahead and log a run.
Once you do that, you want to view your log.
When looking at the log, you want to look for a couple things. One, follow the RPMs on the logger to see where your O2s are. .92v is what you want to tune for. Higher then that is rich and lower then that is lean when at WOT. Also check out the timing curve. If your timing curve has dips in it at WOT when going through the RPMS, most likely that is knock.