ive been messing around learning redstone stuff on minecraft recently...testing different ideas for machines and learning to build various types of circuits...ive compiled quite a few of them on this map if anyone wants to check em out...nothing too advanced but some are pretty kool or useful...or could be turned into something useful...lemme know what ya think or if ya have questions
http://www.mediafire.com/?6vgdoacggqdrb85just extract it to your saves folder for MC
%appdata% -> .minecraft -> saves
or
c:\users\yourusername\appdata\roaming (usually)\.minecraft\saves (if you're using windows 7 anyway idk bout other OS's)
Edit - updated link with newest version ... added a few things to make it more 'exploring friendly' ... also added a couple more machine ideas...including an automated music machine using noteblocks and a looped cart...can adjust the timing of the notes using repeaters and the notes of the noteblocks themself by right clicking them
Edit 2 - yet another update (ill prolly make lots of udates n changes..if ur interested just check back once in awhile i guess) added a newer design for the music machine...also a simple to construct single use monster trap (meaning the current gets stuck in a loop effectively ''locking'' the trap when triggered) i plan to expand upon that idea by making it where it moves the trapped creatures to a different chamber...tho as far as right now i think it'd still have to be manually reset...i also added more signs to help navigation...and a storage box with some items,tools,and redstone to allow you to make ur own stuff or modify mine