One of many ways to boost your blog traffic is by adding good widget to your blog. By adding the widget people will visit your blog to use your widget and of course read you content. If your blog have good content so people do not mind to visit your blog.
Some good topic of widget to collet people visit are:
* PDF convertion tools
* Office tools
If you are using blogspot you can choose many good widget from layout section. Or you can search on google with the specific topic add on for webmaster or blog.