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Note that the block displaying "Recent blog posts" cannot be easily customized to display fewer than 10 items. This number is hardcoded and there is a forum discussion on this limitation: http://drupal.org/node/15635. Apart from changing the source code, there are other alternatives to having recent blog posts:
Create your own "recent blog posts" block with some snippet code:
- one user blog: http://drupal.org/node/23230
- all user blogs: http://drupal.org/node/23229
and put a more link to the /blog.