Referring to your original idea:
I imagine it would work like an embedded Google Maps' map [...]
Google maps are visible in blogs because iframe codes are used to embed them (in non-wp.com platform). Since you imagined it to work like an embedded Google map, I gave you the technical solution for that. And it just so happens that a blog can be embedded the same way Google maps are embedded in sites (other than wp.com) - that is using iframes.
I have also mentioned that you have been able to pull it off because of how your blog originally looks. If you want to stick to the iframe solution, then I would advise you to have a simple looking blog (no header, no footer, no stickies, no side bar, no welcome message, no header widget, no featured image or featured post, no frills). Keep it stripped like it already is and also make sure your blog doesn't show too much on the home page. That is, if you set your blog to show more than one latest post, make sure you truncate the post or use pagination. Even so, don't set your home page to show more than five posts.
If you set your blog to show one latest post only, make sure it does not ever take up too much space (again, use the "more" tag to truncate the post or use pagination.)
*Although I have never taken a close look at a donkey's behind (and so I am not an expert judge on its looks), I believe your blog is looking nothing like a donkey's behind.
At best, it's looking like content put in a scroll box.
On the other hand, techwoman has a rather cool idea and you can embrace it if you can compromise with the fact that it won't like an embedded Google map. It will fetch headlines of your latest posts (some even fetches images and opening lines).
Some free rss services are:
widgetbox, bloggybits, vuvox express
Just google to get the link to their home page.