Here is sample website review with some design recommendations I sent out in the past. I think many of the tips are still very relevant.
I reviewed your website and here is my initial analysis and observations on what I would improve. Overall you have a lot of good information and diversity of content (blog, video, podcast, reports, and tools) that’s outstanding. Also you have a decent page rank (4) and a number of links pointing to your site. The main improvement your site needs is proper optimization and link building (pages setup to target specific keywords and emphasis on building links to also target those same words.)
Although I did check out your entire list of sites, I focused most of my review on your most established website (url removed for privacy/) and separated my review into three categories: SEO (Search Engine Optimization) or things that would affect search engine rankings, design / aesthetics and usability, or how easy it is for users to find and accomplish tasks.