This is a nice module with an easy drop of blogging feeds. I think it's out of date though, and didn't work for my Joomla 1.5.2 installation. I had to modify one of the files in order to have it successfully subscribe my page to the various sites. The modifications I made are here:

http://www.bluebridgedev.com/developers

I'm pressed for time, but I'll email the author, and maybe make the changes permanent (check the license, etc.)