www.runnerslife.co.uk has some good blogs on, from top runners. It was reading the training that the guys do that made me realise they aren't superhuman, just hard workers, and encouraged me to actually go training properly at the turn of the year.
Of the blogs on there, most are good to read to some extent. I usually enjoy Matt Barnes and Aaron Scott though, because I can relate to the distances they run. I think the key is to find someone who writes nicely and runs similar races to you - so for me that means an ultramarathoner's blog is just words, but a top 10k runner has a lot more resonance,