http://wordpress.org/plugins/wp-clone-by-wp-academy/ works nicely for smaller websites!

I've been using http://wordpress.org/plugins/wp-clone-by-wp-academy/. It works nicely!

Just 3 steps:

1. Install the plugin on both sites.
2. Use the plugin to generate a backup on the old site.
3. Take the backup URL it gives you and plug it into the plugin page on the new site, hit go, and your migration is complete in just a few seconds!

It adjusts all the URLs automatically - including serialized string replacements - so no risk of losing widget configurations, etc.

The only issues I've had are with some websites with larger databases (~300MB), which caused PHP script execution timeouts during import of the site backup.