Distance Education and E-learning for K-12 Companies

Here is a list of e-learning companies and distance education solutions providers for k-12 education.

Blackboard E-learning
Adobe E-learning Solutions
Emantras E-learning Solutions for K-12: Engage, Empower, Educate
Desire to Learn
Moodle-open source platform for the distribution of distance learning and e-learning curriculum for K-12 students
K-12 provides public, Private, and Home Schooling Curriculum which means online High School, Elementary, and Home school for K-12 students.
Elluminate- provides e-learning and collaboration solutions for k-12 education

Training and Curriculum Software for Rapid E-learning Development:

Articulate has several tools and is very popular.
Adobe E-learning Suite including their flagship Captivate
Powerpoint and Keynote from Mac can also help creating visual communication and learning
Of course there are a host of web 2.0 tools including video and Skype which can be used to fill the gaps. Moodle is one of the examples of these tools (blogs, wikis, and podcasts are also available for free)
For audio the free tool Audacity, Sound Fourge, or the Macintosh’s free tool Garage Band (and perhaps iMovie) may prove helpful.

Finally Education Atlas provides a fairly comprehensive rundown of many k-12 e-learning companies. Of course the Open Directory Project (DMOZ) and Google directory also have directories of e-learning solutions and companies.

Finally, E-learning product comparisons by demonstration (or example) at the University of Delaware are helpful.