You've spiffied up your blog and now have all kinds of helpful and attractive gadgets in your sidebar. This is a good thing. Unless your sidebars are now so cluttered that your readerss can't find what they're looking for.
Visual clutter quickly happens, especially as your blog hosts add all kinds of fancy new gadgets for you to try. It doesn't mean you have to use them all, or that they are even good for you blog. For example, preview posts from other blogs sometimes simply don't support your mission. Think about whether you really need that information to make your blog better.
What about your label list? Do you have a nice, concise group of categories you shovel each post into, or is your list a mile long with one post in each unique category? Get rid of it, if so. Those post labels mean nothing to your or your readers.
Also look at your archive gadget. Is it showing daily post titles for the current month? Collapse it, so that only the months are listed. Much neater and will free up column room for a more important addition.
In Blogger, you will make these changes in the Layout section. Go now and tweak a bit, so that your blog is more attractive and easier to maneuver.