Michael Foord's blog post highlights the advancements made by Harry Pierson, known as @devhawk, in developing the IronPython debugger, with a particular focus on the new REPL feature. The blog provides insights into the debugger's implementation, encouraging readers to explore it further by accessing the source code available on GitHub. The post is endorsed by Chris Wanstrath, also known as @defunkt, who appreciates the progress and invites others to delve into the debugger's capabilities.