Hide the fact that you are using WP Robot by limiting access to your robots.txt file. I use a plugin to do it easily.
Never ever do this!!! Because it's a best way to show Google something you don't want it look at! If you want to hide something (e.g. some plugin folders etc),
always use the 404 redirect. So when Google (or somebody else) would like to check your blog for some plugins, he/she should be redirected to 404, which says that the requested page doesn't exist.
For example, here is a demo autoblog: http://www.cyberseo.net/demo/magazine-style/
This autoblog uses the CyberSEO autoblogging plugin, but there is no way to detect its presence even if you know the actual path to the plugin or any of its components (/wp-content/plugins/CyberSEO/).
So if you try to open http://www.cyberseo.net/demo/magazine-style/wp-content/plugins/CyberSEO/ you will see 404 page which is similar to http://www.cyberseo.net/demo/magazine-style/blah-blah-blah and says that the folder/file you are looking for doesn't exist!
This is the only way to hide your autoblogging tools from Google (both auto-spider and real humans). However, if you do the same with any other non-professional autoblogging plugin which is unable to hide itself, you'll see something like this:
Forbidden
You don't have permission to access /wp-content/plugins/Place-Your-Plugin-Folder-Here/ on this server.
So, once again - robots.txt is not a solution.
And one more essential thing about autoblog protecting. Many autoblogging plugins (check yours!) shows the original syndicated post GUID's in the RSS feed of your autoblog.
For example, if you are pulling content from http://feeds.ign.com/ignfeeds/dvd?format=xml, all posts in your RSS feed (yourblog.com/feed) will have ign.com fingerprint in their GUID's. E.g.:
<guid isPermaLink="false">http://dvd.ign.com/articles/119/1199920p1.html?RSSwhen2011-11-03_134300&RSSid=1199920</guid>
This is how Google and other search engines will catch you!
The conclusion. If you are using a non-professional (free or premium - doesn't matter) autoblogging plugin, which can't hide its own presence, and even can't cloak the origin of syndicated content -
your autoblog will be banned.
Hope you'll find my tips useful.