I don't think tongue tricks are the thing at all - though the tongue is a muscle so having a fit, limber one can't do any harm :smile: maybe it is just going to give you better staying power. Nothing more frustrating for a woman than a tired tongue.
As for what does work - it varies I suppose - my bf is completely amazing at cunnilingus, he has it down to a fine art. He isn't formulaic so there no easy way to describe it - he varies pressure, length of stroke, direction - all combined with g-spot stimulation - and timing is key, he knows when to give me more stimulation and also when less is going to send me over the edge. He's never given the same head twice, if you know what I mean, it's all about judging my reactions and responding to them. Another huge factor is, of course, that he loves doing it.