The main version should NOT have wordmarks / words included. If you include a version including LTC or Learn the Cloud in addition to the image-only version, that's bonus points.
I like clean lines. Do not include gradients, as I need to be able to print it on physical media (too many colors may be a problem). The average age of viewers of the logo will be 22-35, and 75% male. They will be primarily located in the US, India, UK, and Australia (80% in these markets).