Sometimes when we visit other blogs we found some blog having very small font or some blogger having very large font. We can put the widget text size to solve that problem, so the visitor can setting by their self about the size of the text at the blog.
Actually this widget I found on Bloghack and i think it is the good solution for your blog too.
The Steps are:
1. On your blogger dashboard >Layout > Add Gadget > Add HTML
2. Copy and Paste The Code below to your blog
Ok, now you can try it at your blog...