DS Daily: Those wacky handheld accessories

When we stumbled across this feature at Modojo, we thought it simply too good to resist as a candidate for our question of the day. Over the years, there have been some pretty random accessories for handhelds, and as for the rest, opinions differ on what's worth the money and what may be a waste. We've covered a few, and comments vary wildly. Since it is a topic that each of us seem to approach differently, we thought we'd ask: over the years, what have you bought to maximize your handheld gaming experience, and what seems superfluous to you?