Forum Moderators: open
"Experimental" type pages are dangerous if they are uploaded to your domain only if they contain duplicate content as other pages, or other undisclosed reasons as appropriate.
One way to cover yourself is to use: <meta name="robots" content="noindex"> in the head section of these type pages so they will be ignored by the bots. Of course, paying better attention to what you upload wouldn't hurt either. :)
Something similar came up last week.
If you don't believe me (AND YOU SHOULD NOT) you can always download xenu link sleuth and set it loose on your web site and see what it will find. A spider follows a similar path, jumping from link to link - unless it's looking for a specific file/directory name with a specific document in it.
I've got client mockups, staged sites, secret sauce recipes, all kinds of stuff sitting on my site and nothing has ever touched it.
You would have to sucessfully guess the directory names to do it.