An interesting article, including source code (in Java) on how to create flow maps has been released to the public. Not sure how new this is, but the interesting part is that the whole paper is online, as well as the source code, compiled version and sample data are available for all.
For those that are not familiar with flow maps, one only needs to consider what it is they are trying to communicate, and that is flows. Having an origin and destination, plus a weight value (i.e. number of flights, migration numbers, etc) one can create maps that communicate these flows. Sample images are provided in the link above that show migration patterns from and to California. The paper is a fascinating read, and the ease of use of this piece of software is amazing. Have at it geospatial community.
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