Even more recently than this (May 2009), Killer and Axhausen of ETH in Zurich produced a paper on Mapping Overlapping Commuting Areas. It is very interesting and even mentions my 2009 paper on flow mapping (though I wrote about migration and not commuting)!
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipZpsTLafNu83bQ-ERMAX_bonWJAh807HsWsIQtht6_kX1a6_-kMF6MkXL8Rl3WHXLMGqrSm2rvoD8iqasEDkxpW_oR5ZkbKfjBgRsU2mU4Q9eCaC7guJnB2223ThPUPcZThOzfWCwfK8/s320/killer_axhausen_2009.png)
So, a new flow-mapping-related project is in the works... Look out for more in the future.