Here are some interesting Projects we've made:
The air-powered projectile launcher - great for getting a line into a tree, to get an antenna hoisted high!
The 40m-6m End Fed Antenna - very simple, effective and quick to set up solution for temporary use situations.
Projects we can recommend:
Earl Pack's AE5PA project blog has a number of interesting projects, including some designs that allow you to leverage an existing typical parking lot light pole to support a vertical antenna mast.