These types of things can generally be found in the board sections dedicated to the particular games to which they apply. The first place to look is at the very top of the first page of each board section, since these game-aid topics are usually “sticky” threads that always stay at the top. I’ve posted a few examples below. And in the House Rules section you’ll find a wide selection of similar items, though of course they’re not part of the official rules.
Missing Setup Charts? Look no more!
http://www.axisandallies.org/forums/index.php?topic=6226.0
Topic: Game Aids Europe 1940 2nd Edition
http://www.axisandallies.org/forums/index.php?topic=31342.0
Pazific 1940 2nd Edition Charts and Aids
http://www.axisandallies.org/forums/index.php?topic=31352.0
94Canuck’s Spring 1942 Battle Board - Game Aids - IPC Chart
http://www.axisandallies.org/forums/index.php?topic=22857.0
Modified Setup Cards for countries, IPC tracker, extra mobilization cards.
http://www.axisandallies.org/forums/index.php?topic=32967.0
Another good resource is the homepage of the overall site…
…which has, lower down on the page, a “Categories” index of the various A&A games, along with a number in parentheses saying how many articles (most of them by David Jensen, the site owner) are devoted to that game. Click on the game name and you’ll get a clickable list of articles, many of which contains all sorts of useful pictures, charts, lists and so forth.