A couple of people have said that when they try to open the InfoPathDev.com Example .zip files, that they are blank. It appears that there is an incompatibility with the Windows XP built-in ZIP functionality.
I'm using the Windows 2003 Server built-in ZIP functionality, and I've been told that the .zip files open correctly when using either WinZIP or the Windows 2003 Server built-in ZIP functionality, but that they appear empty with the Windows XP built-in ZIP functionality.
Strange as that may be, if you download a .zip file and it appears empty, try opening it using WinZIP.
Greg Collins [InfoPath MVP]