The Following widgets we found quite helpful for bloggers.
Thumbnail latest post widget
The most hottest widgets for Blogger, created by BloggerTricks. Many of us might have used Wikio and other widgets which grab its content from RSS to display link on their sidebar but with the launch of this "Thumbnail latest post widget" made the Blogger as well as the blog readers to grab the latest article post with a thumbnail pictures. And benifits of blogger is that they don't have to edit their widget every time they update or edit their posts.
Random Posts Widget
None of your valuable posts will be lost, all of them are open to access by your blogger readers with this widget. This widget shows off all the links of the posts your blog randomly and shuffles all the old and latest contents together. The Site Blogdown created and put forward this helpful widgets to the Blogger users. There are two option: (i) random post list (ii) random post links with summary.
Total Post Counter
You don't need to count your posts and comments daily Or you may want to show off your number of posts to your readers for the popularity, then Bloggodown has published a simply and useful posts and comment counter widget.
This is an amazing and the very useful widget for the Bloggers as this helf the post to relate your post with other such topic post and help your reader to go through those post. It works and depend upon the tags provided to the posts. This Widget can be obtain from Blogspottutorial.