Here you have a new roundup about a bunch of great tools for making charts and graphs.
You can choose between web generators, flash,  javascript libraries, Silverlight or PHP classes.

At the end of the post you find also 3 tutorials to make pure css bar graphs and another one for Adobe Illustrator.

JS Charts (JavaScript based chart generator)

js-charts

Protovis (visualization toolkit for JavaScript)

chart4

Visifire (open source data visualization components powered by Silverlight & WPF)

chart6

pChart (PHP class oriented framework)

pchart

Ejschart (Javascript)

chartx

XML/SWF Charts

chart3

Chronoscope (open source)

timeline

Open Flash Chart 2

chart7

FusionCharts Free

top5

JFreeChart (flash)

jfr

Flare (ActionScript library)

flare

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Google Chart API

google

Google Chart Generator

chart_01

Timeplot (DHTML-based AJAXy widget)

timeplot

CSS Chart Generator (web on-the-fly generator for bar charts)

viper

YUI Library

chart9

PlotKit (Chart and Graph Plotting Library for Javascript)

chart10

Flotr (javascript plotting library based on the Prototype Javascript Framework)

flotr

Raphaël (JavaScript library)

chart11

Protochart (Open source library – Prototype and Canvas)

points

Bluff (JavaScript port of the Gruff graphing library  for Ruby)

bluff

Pure Css Line Graph

chart12

Pure Css Data Chart

css3

CSS Stacked Bar Graphs

stacked

Illustrator tutorial

illustrator