This is something I did a while ago, but never thought about making a post or tutorial out of it, until I was reading a friend's blog this morning. Sharon, at Good, True and Beautiful, did a post a few months ago on how to make your Blogger profile a little spiffier.
I have multiple blogs: my personal blog, Moving Forward, BBD, a blog for my Usborne business, one for my Classical Conversations homeschool (private) group, a photography blog that I've long neglected and a few test blogs. I don't want everyone seeing my "blog clutter" so I hid those other blogs.
Sharon did a wonderful tutorial on how to do just what I did. If you have a few extra blogs, like those for playing around with your template (but not if you have a custom one because that is a no-no), this is a great tutorial to follow.
Special Note: When you go over to Sharon's site, you need to ooh and aww over it. She is another talented do-it-yourselfer, doing all her own blog design work. I first discovered her blog when she asked me to do a private blog critique. She had a great blog already, but was very receptive to the few changes I suggested. Her blog continues to grow and blossom every day! It really is "Good, True and Beautiful."