[ydl-gen] ISO build versions?

[Dene Stringfellow]

Does anyone know what the differences are between the following iso 
builds are?

yellowdog-5.0.2-20070613.iso 
<ftp://ftp.oregonstate.edu/pub/ydl/iso/yellowdog-5.0.2-20070613.iso> 
3855780 KB 	29/6/07 	13:47:00
yellowdog-5.0.2-20070629.iso 
<ftp://ftp.oregonstate.edu/pub/ydl/iso/yellowdog-5.0.2-20070629.iso> 
3855780 KB 	3/7/07 	03:30:00
yellowdog-5.0.2-20070711.iso 
<ftp://ftp.oregonstate.edu/pub/ydl/iso/yellowdog-5.0.2-20070711.iso> 
3855780 KB 	12/7/07 	17:25:00


Also, do any of them give you option to setup a server?

Thanks in advance.