The Guardian newspaper in the UK now has a dedicated running blog. One of the first articles they have posted is a collection of The Best Running Websites. Most of these are blogs or advice sites but there are a few tools and something a little more practical.
For those of you wanting to persistently beat your own times, here is a useful pace calculator
I already use Endomondo on my Android app, connecting it to my facebook page so I (and others) can keep an eye on my progress.
Keep an eye on the blog, I suspect this will be a regular thing!