Brad over at smallbusinessbranding.com has written a good introductory text on marketing on MySpace. He has good ideas and does cover some of the techniques you can use to make it less time consuming.

It is an introduction only, so if you want to do it well, and be effective do a lot more research before starting you marketing campaign.

Read the article at http://www.smallbusinessbranding.com/590/myspace-marketing/