Not that I employ the techniques in actual game (because I actually find card games quite boring), I have learned a multitude of 'gambling techniques', as a means to improve my magic.
I regularly use a palm, peek and crimp commonly attributed to the worlds of gambling, and I use many other sleights that have either been developed into gambling moves, or developed from a gambling move, such as a multitude of shifts, the hop move, palming techniques, culling, false shuffles/deals, peeks, switches, and on and on.
The 'ga,bling move' I use most frequently... probably a very nice switching technique I learned a while ago.
CL