Lovely Charts: Free Online Diagramming Software

[app103]

Diagrams are great, because they are a very simple and extremely efficient way to intelligibly represent even the most complex ideas.
But drawing diagrams can also be very complicated, simply because most diagramming software require you to draw.
Lovely Charts' motto is "You think, we draw!"

Diagrams are made to communicate. Every single symbol available in Lovely Charts has been crafted with love, to enable you to create great looking diagrams that will impress, convince and seduce - even if you don't have the slightest design skill.

With Lovely Charts' extremely simple and intuitive drag'n drop drawing mechanism, you'll be able to focus on what really matters. You won't have to draw boxes or arrows, and you won't have to worry about what symbol to use.

http://www.lovelycharts.com/

[gexecuter]

That seems like an interesting service, thanks for the find! 

[TPReal]

I've been using it for a while and I must say that although it lacks some functionality (more symbols would be nice, for instance), it is much user friendlier than Dia, and also the diagrams look nicer.

If you export the diagram and see that the rounded corners look ugly, then export again in larger size than the default (like 5 times larger) and then the corners will look OK. Then you can scale it down using some graphics program.