This is a reminder that you need to be careful of relying on any one service for anything. That particularly applies to internet services. Not only can internet companies, sites and services be spun up quickly, they can also be terminated in a heart beat. How many times have we seen a service shut down with just a screen explaining they can no longer continue. This is slightly different as the service provided by Yahoo! named MyBlogLog sent out an email to members in March I believe, and also in April, and the site has this notice as you can see below.
You may have been relying on MyBlogLog for many blog related services and thought that it is provided by Yahoo! so not to worry. However even the big companies turn off services. So regardless of what services and companies you may rely on for your web experience or online business, be sure not to put all your eggs in one basket and diversify service providers.