Mod — please read through the comments and related articles on the situation why yongzh's emulators were pulled from Android Market. It might be related to the violation of license terms, although nothing is confirmed. It might also disappear from SlideMe under the same reason. —scotty
yongzh's popular emulators for android are currently free on the SlideME app store. They'll be free for approximately 2 weeks. Inlcudes Nesoid, SNesoid, Gensoid, GBCoid, Gearoid, GameBoid and Ataroid.
N64oid is now also free.
For those who don't know, Google has completely banished emulators from the official Android Market (possibly due to Sony Xperia Play's influence) due to copyright infringement.
There are also rumours of YongZh apparently ripping off open-source code and integrating it into his own apps (in other words, he's making money out of stuff that should've been open source to begin with)
Discussion at Reddit