This document discusses open courses and informal learning in a Web 2.0 world. It outlines several research questions about how self-learners use open educational resources to learn and how their learning can be supported. Specifically, it examines issues related to the production and formats of open resources as well as how learners participate in site-specific and topic-based online communities. The document also analyzes dimensions of course "openness" and models of open course design, including the stimulus-response model versus the divergence-convergence cycle model. Finally, it proposes additional research questions about hybrid open/for-credit courses, self-learners' needs, recognition of learning, and communication across different levels of learning.