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 Keith Hutchinson, Freehand 10’s Product Manager; Apple’s very first retail customer, Chris Barylick; and John Welch, who is at WWDC and will provide a report. Oh – and there are loads of prizes being given away, so be sure to tune in.