Two great tastes that taste great together--that's HubSpot & Litmus. We love them both and love their newly released Science of Email Report. This report is a must-read for email marketing for associations.
Big key areas to note for associations are the fact that people prefer emails with more images, HTML and that iPhone is the top email client being used based on Litmus' survey data. The report also includes a handy glossary that's great if you're new to email marketing or just want to sound like the cool kids at Litmus.