As I wait for Fallout3 to appear on Steam - less than an hour to go, I'm watching a piece on the Business News Network featuring a woman who bought a refurbished blackberry from Telus and found that none of the previous owner's info had been deleted. (Apparently containing some confidential business info.) They sent her another one, and all the info of the previous owner was again still there. They then sent her a brand new one. Telus claimed that they adhere to "strict" standards and wipes 'em clean, then sends 'em to RIM for a second cleaning, before selling a blackberry as "refurbished." Telus is currently looking into how this happened, but the woman said they seemed pretty disinterested in her communications with them.
I'm not too familiar with these things, and am not sure why a person wouldn't delete their own info before giving up their blackberry, but thought it was interesting enough to post.