Working on a collaborative project that's too complicated (or annoying) to be conducted over email or even Google Docs? Use a wiki, a collaborative software tool that, if used well, can be a great boost to productivity by cutting out inefficiencies. But it's important to pick the right one, and to manage it wisely. The blog Internet Duct Tape tells you how to keep your wiki from sucking, and the wizard at Wikimatrix lets you know what wiki you should use based on your project and the tech-savviness of your collaborators. I use Unfuddle for my software projectsit costs about $20 a month but is great for keeping track of really complicated projects and allows me to differentiate between big problems and nit picks.