Block Certin Pages/Posts From Search Engines: Wordpress

The title explains it all. I would like to block a particular post or page of my Wordpress blog from search engines. I am wondering if there is a plugin out there that I can utilize to accomplish this, or perhaps a code that I insert into the post.
The thing is that I want to do a post about a company from wikipedia as it will be great info for my users, but I don't want to get smacked down by Google for it.
On another note, how badly would I get smacked if I simply posted it? I have a lot of original content.

robots.txt is your simplest method

I have a plugin that generates a new robots on command, so I run it like once per week. I could still take the page out of the robots.txt manually. So my robots.txt reads:

# BEGIN XML-SITEMAP-PLUGIN
Sitemap: http://site.com/sitemap.xml.gz
# END XML-SITEMAP-PLUGIN

Anyway I found a way exclude pages and posts in that. Sorry for being a total newb sometimes!

Should I not use a sitemap. I did not realize that this was all that there is in the robots.txt until now. I heard that a robots document is very important. Do you think that this is a bad thing or fine because it is just redirecting the spider?

Also, sometimes I here it is important to exclude categories. Is this true? What about the tags?.......

Thanks for everything. It's nice to know that there are people here that know their sh't!

It's also good to know that I am not the only newb here.

No you want to use a sitemap so you do get indexed on the pages you want. Just block out the pages you don't want in your robots.txt and you will be fine.

You can also use robots meta wordpress plugin to selectively block the pages / posts from indexing.. Have attached the plugin. gives full control for pagess / posts

Thank-you for this!