I have an existing software company that serves graphic designers with a plugin that exports web files from Adobe InDesign:
http://ajarproductions.com (main site)
http://in5.ajar.pro (main product)
I'm building an online video course library (similar to Lynda.com) that is specific to my product and audience.
Ajar Academy will serve professional graphic designers and top-quality, highly-specialized video courses related to digital publishing.
The logo for the video library should fit in some way with my existing brand (links above).
Ajar is playful, personal, but also professional. It aims to enhance the work lives of designers.
Some thoughts after seeing several logos posted for this project:
1) Making a fancy "A" or "AA" is not enough. It doesn't say anything interesting about the service itself.
2) Play buttons have been an effective use of the "A." It's not absolutely necessary to include a play button, and I encourage you to think creatively about other approaches.
3) The *video* library is digital, so don't put too much emphasize books (there are none).
4) This is not a bank or a large corporation. Sharp, cold logos have not been working well. Think "playful" but useful and valuable.
5) The existing website is a jumping off point, the brand is evolving, but the two should look like they belong together in some way. Avoid blindly copying assets from the website and incorporating them into your design.
6) The logo should appear reasonably simple. Complexity will send the wrong message.