Sony has a tendency to add new features to their DualShock controller without giving comfort a whole lot of thought. The most familiar example to most people is the non-primary position of the left analog stick, but the DualShock 3 (and Sixaxis) have analog triggers that give the stick a run for its money. They have convex button style faces, but they move like triggers, i.e. they pivot. This leads to what should have been an obvious problem during the design phase. While I won't go so far as to say that my fingers easily slip off the triggers when I pull them, I will say that the things feel terribly wrong.
I stumbled across the
RealTriggers while ordering a game on Amazon. I saw that they were well reviewed, if only by a few people in total, and dirt cheap, so I casually tacked them onto my order much as I imagine Sony tacked the analog triggers to the controller in the first place. The package included two of the trigger covers and "instructions" printed in the font used to put the little letter 'D's on pennies. It's just one sentence, and it's vague enough that you'll have to puzzle out how to attach the things from the picture anyway. Thankfully, it's easy enough.
The trigger covers cleverly snap into place over the original buttons with no adhesive required, and they hold on more than well enough to stay in place during gameplay. They can stand up to a very hard squeeze without slipping, in fact, but they can be removed simply by pulling them off with your fingers. Not that you'd ever want to remove them, unless you have a charging stand that covers the triggers for some reason. No, they do their job perfectly. The shape makes a nice resting place for your fingers, and they keep your fingers in place when you pull on them. They don't interfere with the trigger movement in the slightest, either, which was my biggest concern. They even blend in well enough to look like they were always part of the controller.
Overall, I recommend them wholeheartedly. I'd give them five silly pictures out of five, if I had any silly pictures.