Earlier we were using Global translator wordpress plugin, Though later on we realize it was impacting Shoutmeloud SEO and there for we removed the plugin. You can read more about it here :

Global translation plugin problem and solution

Though language translation option is a necessary for any blog, if you will check your website stats, you will realize how many people are manually translating your blog page using Google translation service or Bing translation service.

Though there is a gadget from Google which you can use on your blog, to give an option for language translation.   Google translate gadget is easy to use, and if you have widget ready theme, you can simple add it on your blog widget.

You can get the gadget from this link. Else if you have a blog in English language, you can use this code :

<script src="http://www.gmodules.com/ig/ifr?url=http://www.google.com/ig/modules/translatemypage.xml&up_source_language=en&w=160&h=60&title=&border=&output=js"></script>

Other gadget which might interest you :

• Add gadgets to your Gmail account