Do You Verify Your Downloads?

Do you verify the integrity of your downloads?

I saw a notice announcing a new release of Apache Tomcat Native this morning, and when looking at the page, saw the usual notice, as follows:

"Use the links below to download Tomcat Native from one of our mirrors. You must verify the integrity of the downloaded files using signatures downloaded from our main distribution directory."

That made me wonder how many people who download actually do verify the integrity of their downloads? I know I do, but I've worked with developers who don't. It would be interesting to do a poll on that. I'd also be interested in knowing of any cases where the integrity verification failed. I've never had one fail.