Lismore Software announced the immediate availability of Guest PC 1.8 on Tuesday. Guest PC is an x86 computer emulator application for your Mac that lets you run operating systems like Microsoft Windows at the same time as Mac OS X. The updated version adds support for USB devices, .fs floppy disk images, fixes several bugs and improves performance. Guest PC 1.8 is available for download at the Lismore Software Web site, and is priced at US$69.99. The update is free to current customers.