Just Want to Do Simple Diagramming

How to do? Visio is expensive and huge. MS Paint can't draw nice arrows. Will PowerPoint do? Ppoint can make pdfs also and has nice arrows. What about the open-source Dia? This has nice arrows too, if you draw a line it draws an arrow by default, a nice feature. If you right-click the line you get various arrow properties like line-width etc. Cntrl-S will save your file in ".dia" format. If you want to save in bmp for example, you need to hit Alt-FE (File->Export) and select Pixbuf[bmp]. Cntrl-Z is a very useful shortcut for Undo (the usual Windows Alt-Backspace doesn't work) especially if you create a shape that occludes and existing shape. Unlike Paint, you can edit written text using the "Vertical Bar" (Text edit tool).