Five Client-side GCharts are shown below (click on them for a live demo):

• The Chart Gallery contains additional (and simpler) examples and corresponding screen shots.
• The GChart javadocs contain the detailed API specs.
• See Installing GChart for how to include GCharts within your GWT application.
• See the GChart 2.5, GChart 2.41, GChart 2.4, GChart 2.3, GChart 2.2 and GChart 2.1 release notes for recent changes.

The main idea behind GChart is simple: You can make very nice charts efficiently out of a reasonably small number of 1-cell Grids (for the aligned labels) and (empty) Images (for everything else), styled and positioned appropriately on an AbsolutePanel. Not surprisingly, bar charts don't suffer at all under the limitations imposed by this strategy--but (as long as you don't mind using dotted connecting lines or banded-filled pie slices) line and pie charts also do remarkably well.

GChart 2.5 was tested with GWT 1.5.3 and 1.6.4 in FF2, FF3, IE6 (quirks), IE7, IE8 and Chrome.

Where's the forum? Just use the GChart issue tracker. You can also use the general GWT forum, but the issue tracker is best if only GChart users will be interested in your post.