UMapper's now got quite a few more features, the best one is the (beta) ability to import data in GPX, KML and geoRSS formats. Preliminary mucking-about has resulted in me importing a whole load of my Lake District walking routes from the Memory-Map installation on my lappy. Be warned - it takes a while to load. Later on, I'll get around to adding some notes/markers/lines etc., but for now, WYSIWYG.
I've been playing around with UMapper, another nice map-making service. It says that it's "the first universal web-based map-layering engine", and they claim that it's good for Blogger and WordPress, amongst other blog services. You get the choice of Google Maps, Microsoft Virtual Earth or OpenStreet. I've had a go with the Wordpress plug-in version and made this without having to leave the WP admin area:
[umap id="1747" size="l" alignment="center"]
STOP PRESS! July 23rd 2008: Version 1.2.0 of the UMapper plugin was released, but it broke the blog when I updated to it, preventing me accessing any of the blog admin. I had to delete the plugin files and reinstall version 1.1.8.
STOP PRESS! July 25th 2008: Version 1.3.2 of the UMapper plugin was released, but it broke the blog when I updated to it, preventing me accessing any of the blog admin, and giving the following error-messgae: Fatal error: Cannot redeclare media_admin_css() (previously declared in /home/beardedg/public_html/wp-content/plugins/umapper/Umapper.php:140) in /home/beardedg/public_html/wp-admin/includes/media.php on line 198. I had to delete the plugin files and reinstall version 1.1.8 again.
STOP PRESS! July 27th 2008: Version 1.3.6 of the UMapper plugin was released, but it broke the blog when I updated to it, preventing me accessing any of the blog admin, and giving the following error-messgae: Fatal error: Cannot redeclare media_admin_css() (previously declared in /home/beardedg/public_html/wp-content/plugins/umapper/Umapper.php:140) in /home/beardedg/public_html/wp-admin/includes/media.php on line 198. I had to delete the plugin files and reinstall version 1.1.8 yet again.
STOP PRESS! July 28th 2008: Version 1.3.71 of the UMapper plugin was released, and it installs but doesn't work right yet (nothing happens when I click on the "Add UMapper Map" icon in the write post admin screen). Many thanks to Vic for the info about the update.
STOP PRESS! July 28th 2008: Cleared the cache and rebooted, all's working now. Happiness is restored. 
