Indeed, the Zacate E-350 is in, among others, the following 11-inch "notbooks":
In addition to the notbooks, unlike the Atom, the E-350 is readily available in larger notebooks. To name just one model, the Toshiba Satellite C650D lineup includes an E-350 based 15.6" laptop with a DVD player/writer and a webcam/microphone for just under $400. There are also E-350 based motherboards for people who prefer to build their own computers.
Looking at the Passmark list of CPU benchmarks, the Zacate E-350 non-GPU performance is nominally (about 15%) faster than a dual-core Atom . Where it smokes the Atom is with GPU (graphics) performance. It is about three times as fast as Atom's built-on GPU, and nearly twice as fast as the ION GPU included with some high-end netbooks.
In terms of gaming--probably the most common way of using a computer where lower performance is noticed--cutting-edge games from five years ago are perfectly playable on an E-350 system. In contrast, an Intel Atom system with the 3150 chipset can only really play hi-end games from 10 years ago .
The improved GPU also results in better video playback. Unlike the Intel Atom, the E-350 can smoothly play 1080p Flash videos. 
Before concluding the performance section, I should note that the Zacate E-350 does not have the memory limitations that Atoms have. The Atom N455, for example, does not support having over 2Gb of memory, but users of the E-350 based Thinkpad x120e have reported expanding the memory to 8Gb without problem.
To make this as much of an apples-to-apples comparison as possible, Lenovo's E-350 system lasts 6.4 minutes per watt-hour of battery charge, and their Atom N455 system lasts just under 8.5 minutes per watt-hour.
So, the E-350 uses 30% more energy than a single-core Atom processor.
I eagerly await Intel's release of their next-generation Cedar Trail Atoms to see if they will have a higher-performance model that competes with the Zacate E-350.
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 The GMA 3150--Atom's GPU--has a Passmark score of 69. The Radeon 6310, AMD E-350's GPU--has a Passmark score of 205. An ION has a Passmark score of 118.
[3a] To cut to the chase: "there were many times when I was thankful for the turn-based nature of the game, since things like number of enemies and area-of-effect spells tend to bog things down considerably."
 The linked article was written before the mainline Flash release had AMD HD acceleration support, an issue that has since been resolved.