There are many different ways of organizing one’s life so you actually accomplish something. The method that has worked best for me is David Allen’s Getting Things Done system. It is only one of many options but if you don’t have a current system it is worth a look.
On his website Allen sells all manner of paraphernalia to help people learn and implement his system but if you can discipline yourself to read a short book I recommend you just read his first book: Getting Things Done.
Allen also produces a blog that provides helpful tips on how to work his system. Here is the latest edition: Productive Living.
Do you have another system that works for you or experiences with Getting Things Done? Let me know in the comments.