Promoting your course!

• Write a short and compelling "teaser" that you can use in emails and invitations
• Twitter/blog/craigslist/social network campaign
• Reach out to interest group mailing lists
• Ask university professors to talk about it (and get involved)
• Ask the p2pu-community list to help you get the word out
• Identify communities that your course is most relevant to. Then post information to their facebook groups, online forums or mailing lists. 
• Reach out to students in courses at real universities - the student groups - see if they would be willing to share in the experience
• Ask interested learners to "bring a friend" (Grockit.com research show this bolsters retention)
• Mainly for courses that have an offline component:
• Post flyers in your neighborhood
• Find a local hackerspace, coworking space, library and post an invitation on their message board