Create Stunning Diagrams On The Web With LovelyCharts
http://www.techcrunch.com/2009/02/09/create-stunning-diagrams-on-the-web-with-lovelycharts/

online tool to create flow charts etc

Lovely Charts is an innovative web application allowing its users to create gorgeous diagrams (flowcharts, sitemaps, organisation charts, wireframes, …) of professional quality without requiring any drawing efforts or design skills.