Six Apart, the company behind the popular Movable Type personal publishing system, has announced that its TypePad weblogging service will be available as a preview release on Monday, August 4. Originally announced in April, TypePad is a hosted service providing “a simple to use, yet full-featured turnkey solution for creating weblogs.” The service will be offered in three flavors — Basic (US$4.95/month), Plus ($8.95/month) and Pro ($14.95/month). You can view the feature list for complete details on service and hosting. Update: Anil Dash of Six Apart let us know that TypePad was created and developed entirely on Macs running OS X. He also said that the service has been thoroughly tested on Safari.