I don’t use flowcharts, but if I did I might find Flowchart.com useful. It’s a free (with signup) online application that lets you create — yup! — a flowchart, replete with linking lines, arrows, boxes etc. which you can then drag to new positions along with their respective connections until the whole pleases you. There are actually more features for the adventurous than I’m listing here, enabling you to embed your flowchart in a website and, apparently, record the flow as a video, among other things. The simplest thing to do is take it for a test drive using the demo.