If you are thinking about importing blogs on platforms like blogger, type pad, Joomla, livejournal, tumblr or other to WordPress. You can do this easily with the WordPress content importer from the WordPress Menu. WordPress has a great web documentation on importing other blog platforms to WordPress.
You can find this documentation at : Importing Blogs to WordPress
And here is a simple tutorial to get you started. You can find the Import Feature on WordPress the the right menu sidebar under Tools.
Then you will be taken to the Blog import page. Then you have to choose which blog platform that you want to import to WordPress. Then follow the steps to download the plugin and you will have your blog completely transfered to WordPress.
If you don’t find the blog platform you are using to convert to WordPress, then you have to search for the WordPress plugin that does that for you. Or you can have a detailed info about Importing Content to WordPress from