Tracking devices are a must have....A MUST HAVE,if you play half seriously.
I only play at PS and FT, with 90%of that PS, PS has their own list of trackers that they consider illegal,there are many many tracking devices out there.
Here's a small list of good tracking methods.
thepokerdb which you can get to by going to bluffmagazine.com.
officialpokerrankings.com
sharkscope.com
pokertracker.com.
pokerpropecy.com.....illegal to use at some sites.
pokercrusher.com '' '' '' ''
Just for the record,i would much prefer to play without them being available to anyone, but since they are out there, not using them only gives your opponents an extra edge.
Something laying -115 every game without using them.
If you play 5 hours a week for fun, don't worry about using them, if you play regularly and don't like bothering with them

, always keep 1 thing in the back of your mind, theres a good chance your opponents know alot more about you then you about them.(NOT A PROFITABLE WAY TO GAMBLE).