Web-based Chart Creator

I love flow charts.  I can't help myself.  They're great for showing workflow, project management stages, even sitemaps (if you tweak 'em a bit).  I make more than I should and it's always a tedious process using the junk software I've found up until now.  But lo and behold, Stephen Abram points us to Gliffy, a free web-based chart creator for flow charts, floorplans, layouts, network diagrams, etc.  Why is it so cool?  You don't have to download any software, you can collaboratively build the flow charts with others, and since they're hosted on Gliffy's site, you can link to them from anywhere.  Yay!