Primary email: ndmitchell AT gmail DOT com
I welcome enquiries and bug reports about any of my projects. If the email is of general interest, it may be useful to CC haskell-cafe AT haskell DOT org.
Alternatively, I am occasionally on the Haskell IRC channel as ndm.
Other contact addresses
For some of the stuff on my website, there are mailing lists which will reach more people than just me, so are usually a better idea if your question relates to that particular topic. I read all of these lists.