As a supplement and a list of collection/community resources, it's a helpful site. Ignore the commercials and go for the "meat" of the resources. The newsletter is also worth reading. Unfortunately, a lot of resources/freelance professional IDs do include commericals on their sites, however, that doesn't mean users can't glean helpful information and stay informed in the field.
The recommendation is to review the blog, the articles, the community links, and the newsletter. Skip the free or paid apps if you're not interested.
This is a START of the journey for beginning IDs-not the end.
This should be used as a reference source for information about Instructional Design.