Just a few ideas for mega-useful extensions (imho): easy ability to do A/B testing - that's the benefit of email marketing: testing is so easy and inexpensive. It would be a brilliant extension for MW. More complex segmentation - It would be fabulous to be able to do slightly more complex one-off segmentations using nested behaviour, i.e. people who have not opened campaign A but have opened campaign B and live in a certain region (as per db) etc. Better reporting - I love the geo/map plugin, but would love to see a campaign level heatmap / click map, too. Something a tiny bit more visual, especially since the URLs are rather undescriptive on their own and only really mean something in sitchu. Sorry if I have simply missed any of these features so far.