Eric “Sheppy” Shepherd has made available Sweet16 2.0 Public Beta 2, otherwise known as Sweet16 2.0b17. In the author’s own words, this new version of the popular Apple IIGS emulator for Mac OS X adds a ton of features, including Ethernet networking support for Marinetti, joystick support, improved graphics, a very handy debugger for Apple II programmers, and CD-ROM support. However, this version apparently does not work on PowerPC systems; an update will be along as soon as the fixed version is tested.
For more information, visit the Sweet16 Web page.
UPDATE: Sweet16 2.0b18 has been released, restoring PowerPC G4 and G5 (but not G3) support back in.