Once you have created your MyMap simply click on the 'Link to this page' option and the code is available to cut and paste into a website or blog:
Once your code is inserted your MyMaps will appear directly in a blog post - as illustrated below:
View Larger Map
While this is a quick and easy route our original 'Embedding MyMaps into Blogger' tutorial is still preferable as it uses MyMapsPlus which allows the sidebar and thus the key to the map to be included in the page.
To be honest we are not sure why Google left out the option to include the sidebar - given that it is a integral part of the map?