Forget declining open rates and click-throughs... when I invited Chicago subscribers to a WordBiz roundtable last week, 100% of those who RSVP'd showed up. We crammed into a meeting room provided by B2BWorks.net, a B2B marketing agency with offices in Chicago's cool River North neighborhood. We had a lively discussion about email marketing and blogs. Yes, declining open rates for email are a big problem. Along with a corresponding decrease in conversion rates. Re blogs, several attendees expressed concerns about the time it would take to write and maintain a blog.…