Was there any reported problems today ?
As you can see from my graph below, my connection went a bit mental today.
(http://www.thinkbroadband.com/ping/share-thumb/37cfb5ffc8cf7d9a7f57bfbe8af62b6e-11-02-2011.png) (http://www.thinkbroadband.com/ping/share/37cfb5ffc8cf7d9a7f57bfbe8af62b6e-11-02-2011.html)
Not today in particular although some users are seeing graphs very similar to yours for a few weeks now. We are unsure of the cause.
http://www.idnetters.co.uk/forums/index.php/topic,24712.0.html
Looks like you had a sudden fall in latency early this pm as well.
Cheers Steve. you can close or delete this post, I've reposted the graph in the link you gave.