Question
Ideas I'm considering:
-more guest blog posts (SPECIFIC suggestions welcome!)
-webinars (I've done a webinar with the Project Management Institute in Nov 2014 and have another in the works; who else can I do a webinar with?)
Website Founded: June 2014
Current Email Subscribers (with Aweber): 141
Landing Page For Email List: http://projectmanagementhacks.com/SponsorReport
Guest Blog Posts published in 2014: over 50 (full listing here: http://projectmanagementhacks.com/portfolio/
Answer
Hellobar is actually a good option but given your skills probably would be best if you use something like http://convertkit.com/