Personal and small business information manager: Get organized, Backpack
“Organize to do lists, notes, images, and photos Plan a personal or business trip Keep track of what your competitors are doing Plan a home improvement project Collaborate on a new business idea Keep track of houses you’re considering buying Gather information for a research project Keep a list of gift ideas for friends Build a For Sale page, Organize and plan a wedding or event”
I am currently using Backpack to manage our Christmas plans for 2005, as well as several business ventures in the pipeline.
If Backpack seems like too much for you, perhaps using another of 37Signals creations would do: tadalist.