The ultimate lifesaver of every party I've ever given - my party planning journal. Designate a notebook just for your parties. Throughout the year, jot down ideas, cut out pictures, paste in recipes, etc. And then keep a log for each event detailing the date, guest list, table style, menu, music and favors. Afterward, record your impressions of the party: memorable conversations, culinary successes and disasters, feedback, etc. This reportage makes for great reading in years to come and will also inspire you to do more entertaining.