iWork '09 works on Mac OS all the way from 10.4.11 to the current version.
"So, once I get iWorks 9 (Old Version) installed on my current Snow Leopard - I can change all my
AW files over to Pages files and have everything ready for a switch to either M or ML?
Yes, provided all of your AW files AW 6 files and are word processing files. AW 6 spreadsheet files can be opened by Numbers '09; AW 6 presentation files can be opened with Keynote '09. Other types of AW 6 files cannot be opened by any of the iWork (no s) applications.