Re-blogs are a great way to spread the word of new post/people that the re-blogger finds interesting, I was glad to see you mention that it is not a good idea to re-blog to much, all things in moderation.

One of the tools I have found very useful on peakd is the list function, I have a core group of people I follow, and like you implied following to many can make it difficult to find the content you like, so the list function and the community list are good ways to separate out the content, to build your own play list so to speak.