I had a DNS cache issue the other day which was stopping me viewing my own websites. I assumed my websites were all down but that's not the case. My host, WiredTree, recommended a great site for checking if your website is really down. It's called Downforeveryoneorjustme.com.
It's a quick and easy way of seeing if your website or blog is online or if it's just a cache or browsing issue you have. Soe for example, typing in
http://downforeveryoneorjustme.com/kevinmuldoon.com will tell you if this blog is down.
I'm sure some of you will find it useful :)