TileView displays the byte/word arrays in a file as colored blocks to aid in finding tilemap patterns, including levels, map screens, and other anamolies. It's like a visual hex editor (minus the 'editor' aspect), that instead of showing hex numbers, shows their colors. Although it can actually view any file, it specially recognizes ZSNES savestates and sets the file position to the base of WRAM (SNES work memory). So far, I've found the tilemaps in the savestates of several games with the tiny program, including Zelda, Mario World, Yoshi's Island, Mario All-Stars, Secret of Mana, Metroid 3, and Donkey Kong Country.
If you are interested in editing your finds, you might use TileView to find them and a hex-editor to change them, like Hex Workshop by Breakpoint Software. There are also different viewing modes to find other types of entities, and by coincidence, TileView can also view mode 7 tiles and fx chip graphics.
TileView .185 - minor
Added colored backgrounds behind numbers in hexview. It should make correlating what you see in the block mode to the what you see in hex view much easier.