Greg's Shareware is extending its half-price offer for Greg’s Bundle - a collection of OS X interface utilities - to the end of next week's Macworld Expo in San Francisco.

Greg's Bundle gives OS 9 the look-&-feel of OS X and includes PowerWindows, SmoothType, and Greg's Browser.

PowerWindows is a control panel that drags windows as solid or transparent images instead of as a dotted outline. SmoothType doubles the resolution of screen text by blurring the edges of bitmap fonts. Greg's Browser displays multiple folders side-by-side in a single window.

Users must register at the Kagi Web site to use the $20 bundle.