I started my blog in Mid January & have built it up to 110 visitors a day. I might check my stats once a week or so. The novelty of checking it daily wore off back in April. Today I was in the Cpanel & decided to take a look at the stats.
June showed 3346 unique visitors. Then I looked at July...
19,250! 
I thought something was wrong, so I hit refresh. It still showed 19,250 unique visitors.
OK, I scroll down to see what's up. It turns out StumbleUpon has sent 15,000+ visitors to the blog post from Sunday.
Here's the link to the post -
And I Thought Windows Vista Had Issues… | Keith Goodrum
Wow, the power of social media.
Keith