Certainly, many of you have heard about Kanban agile-methodology originally from Japan (who have not heard, you can check out here). Trello - service, just based on this methodology and, if in front of you a task management small project, I advise you to try it. Trello also good for use as the sole todo-sheet.
Do you have a list of projects, each of which represents the board is divided into three parts: To do (what to do), Doing (Taxco, are in progress) and Done (something that has already been done).
Each task can be detailed in the Description field, add tags, the deadline by which you need to perform a task, attach to the problem of the participants and is responsible for a task. Also can be attached to the TASK different materials (photos and video), and lists, and add tasks to vote (the latter is not used).
Appendix free, beautiful and very easy to use (5 of 5). Available as an application for iPhone or Web service. Data is synchronized.
Trello | Download from AppStore, free