PermaFLOW is one of those "Why the heck didn't someone think of this sooner" products, and as a guy who has recently had to snake his sink line, I desperately covet one of these award-winning sink traps.
First off, the thing is transparent, so you can see where the clog is instead of staring at your sweaty, aggravated, warped reflection on a chrome trap. Second, there's a knob on the outside that turns a wiper on the inside, so you can clear clogs without having to get in there or snag that stuck piece of jewelry. And turning the knob to a particular position can also enable water to flow through the normally unusued upper part of the trap as an emergency measure.
The PermaFLOW just won Platinum at the 2009 Awards for Design Excellence, which is sponsored by Design Journal.
But you can be darn sure your plumber doesn't want you to hear about this one.