Unreal Speccy Portable is a portable ZX-Spectrum emulator. It supports Z80 128K (Pentagon) AY/YM, Beeper, Beta Disk, Tape, Kempston Joystick/Mouse and Snapshots.

Thanks to http://a320.emulate.su/ and http://boards.dingoonity.org/dingoonity-news/unreal-speccy-portable-0-0-18-for-native/ for the news!

http://code.google.com/p/unrealspeccyp/