The Hall of Fame display in Atlanta will be a strong attempt to "demystify" the efforts of past CA winners and, hopefully, inspire many more teams to submit entries in the future. FIRST is working hard at bringing these examples forward.
However, posting all winning entries is not practical. 2003 was the first year these entires were standardized - four pages. Prior to that, all entires just needed to be viewable in "x" amount of time. So, anything prior to 2003 could be a substantially longer document, video, powerpoint, etc.
As for learning about the teams and "what they are all about" - a visit to team websites can give anyone a good idea. Here are a few:
2003 -
Team 103: look under "award entries" for actual submissions from the past three years.
2002 -
Team 175: All major outreach initiatives are listed and explained.
1992 & 1994 -
Team 191: I highly recommend the "history" section that provides one page for each year of the X-Cats evolution. Cool stuff.
The Award and all historical winners are listed here:
http://www.usfirst.org/robotics/res_art11.htm