Macally on Tuesday introduced four new computer mice that will be on display at the company?s Macworld Expo booth this week. They are: Accuglide (US$19.99), a low-profile, rectangular mouse; Pebble Wireless ($29.99), a multi-resolution (400, 800, or 1600 dpi) mouse that uses 2.4GHz RF and has an oval shape; Pebble ($19.99), a five-button mouse with a programmable, four-way, tilt-wheel scroll button; and Turtle ($19.99), which features a retractable USB cord and a portable size.