ProBlogger is running a series of articles or posts on how to keep first time readers coming back to your blog. The latest installment is titled "How to Keep First Time Readers to your Blog – Part III". I didn’t realise that simple things like enabling an ’email to a friend’ feature and linking to other posts on the same subject made such a difference. Parts 1 and 2 are here and here (respectively).
Part IV has been posted here for your continued enlightenment.