Newbie Help

I have only recently started using wordpress as i was an avid joomla user until they started messing with it. I have a simple quiestion but the answers and solutions out there seem to be overkill for what i need.

Basically i have my main site blog that i post to each day. I have set up 50 more wordpress blogs and all i want to do is post my blog posts to all 50 once i save to my main blog.

In summary.
1. Create a post on my main blog
2. On save it automatically posts to my 50 other blogs.

All the sites are on different domains also

Many of the solutions are expensive or just too complicated for my needs.

Any ideas?
thanks Mark Holland