While you can only publish your own map as a MapKit, you can put a simple version of any map on Platial on your own site. There are two simple versions. One is based on Google maps and the other is based on Yahoo Maps.
The Google map version is an iframe and can be used on most blogs and other websites. The Yahoo version is flash, and can be used on blogs and most other websites, but also on MySpace and many forums.
These maps show up to 40 markers and the titles of the posts from the map. They link back to the map on Platial. They make especially nice additions to blog posts. Also, when something gets added to the map on Platial, the markers automatically show up on the map on your own site.
It would be fun to use these maps for little "map of the week" features on blog posts or side bars. They are really easy to install and you can switch them out for new ones if you need a change. There are plenty of great maps out there to choose from!
Here are some maps that could be fun to have on a blog.
The Fallen Fruit Map by Austin is a great one to use to usher in the Spring. It shows places in Los Angeles where fruit trees hang their boughs over the public space. Austin is an LA-based artist. Fallen Fruit also has a great website. They have a nice Biblical quote on their site: "When you reap the harvest of your land, you shall not reap all the way to the edges of your field, or gather the gleanings of your harvest. You shall not pick your vineyard bare, or gather the fallen fruit of your vineyard; you shall leave them for the poor and the stranger." (Leviticus 19:9-10) This map would make a great blog post, but it would also be a fun thing to slip into your side bar for a couple weeks.
The Shark Attack Map by Bianca200 is updated pretty frequently. This map on your site would give you a picture of the 40 most recent shark attacks worldwide. The full map contains 70 accounts of shark attacks, with links to news stories. This is the map desciption: "This map shows locations of shark attacks. I have added only attacks from the year 2000 until the present. The map is incomplete. It contains all unprovoked fatal attacks since 2000 and some non-fatal attacks. Please add any shark attacks you know about. You are far more likely to die as a result of driving to the beach than you are of being bitten by a shark while swimming. More people are killed by bees than by sharks each year. Elephants kill way more people than either bees or sharks. Still, sharks are scarier."
Famous Film Locations by Barnaclebarnes is a great map to use because you can see all of the spots on the map on your blog and the information you want is mainly in the titles anyhow. The information for this map came from Mark Allen's blog.