The Mac Show, an Internet-based live radio show focusing on all things Mac, has announced their guest lineup for tonight’s broadcast (9:00-11:00 pm ET). Tonight’s guests include Greg Joswiak, Apple’s senior director of hardware product marketing to discuss the iPod; Jim Heid, a technology columnist for The Los Angeles Times to discuss iTunes 2 and iPod; and Chris Breen, a long-time Macworld columnist who will offer tips for speeding up your Mac. Host Shawn King will also examine the differences between cable and DSL modems in the Mac Basics segment.