If you are on Blogger, it is so easy to add this gadget. And it makes it so easy for people to follow your blog (including those who follow lots of blogs and would otherwise hit up against the follow limitations within Blogger).
All you do is go to your dashboard and click Layout.
Then you click add a gadget. It comes up with a list of basic gadgets - scroll down til you find Followers and click the plus sign. And that's it - the Google Friend connect thingy will show up on your blog after you click Save Arrangement - yellow button on the top right.
If you don't like where it is in the layout you can drag and drop it around - but do put it somewhere where your readers can find it easily - don't tuck it away at the bottom of the page.
If you are on Wordpress you can install it too. Obviously I haven't done that myself. But this is a link to a site telling you how to do it.