Below are some ads for visualization tools, which is close to what Jiri originally asked about.
As you can see, I use gmail, a free email service run by Google. Google makes money by delivering ads to the user (me) in their web mail interface. The ads are out to the side of the mail, not embedded in the mail that I send or receive. The ad content is based on the content of the email thread, and is often _highly_ relevant, as one might expect from Google. Below, I've copied the ads that were shown next to this email thread. I have no connection with Google or gmail, other than being a satisfied user. I just was amused and pleased by the relevance of the ads that gmail picked out and showed me. More info about the gmail ads is at http://mail.google.com/support/bin/answer.py?ctx=%67mail&hl=en&answer=6603 Cheers, - Jan Tom Sawyer Visualization Scalable and incremental graph analysis, layout and visualization www.tomsawyer.com JFreeChart Free / open source charts for Java Complete source code! GNU LGPL www.jfree.org FusionCharts Data-driven animated Flash Charts Use w/ ASP, ASP.NET, PHP, CF, JSP www.InfoSoftGlobal.com/FusionCharts Charts & Graphs Component Professional, flexible, interactive and web friendly charts and graphs www.advsofteng.com ---- election-methods mailing list - see http://electorama.com/em for list info