At BlogMap you can geo-code your blog by entering a primary city, zip/postal code, country and your blog feed URL.  Then you can link to your own BlogMap or display it as an inline image (you should be able to see a blog map for this blog just to the right of this paragraph) using a fairly simple URL!

Very cool, if you ask me. :-)

[edit: link correction, plus added break to clear past right float image]