Ok...Here's some...

US...
http://california.metrofreefi.com/city/San+Francisco.htm
http://www.gcensus.com/index.php
http://www.realeats.com/Minneapolis/
http://www.onnyturf.com/subwaymap.html
http://www.socaltech.com/intelligence/map/
http://pool.dylantree.com/pool_map.php
http://www.lostacotrucks.com/index.html

UK...
http://spod.cx/speedcameras.html

Ireland...
http://www.rosebudsoft.com/GoogleMapsDublinCams.htm

Japan...
http://maps.google.com/maps?q=tokyo%20art%20beat&spn=0.007071,0.014718&hl=en

The list could go on forever :-)

Here are some more, created from the Yahoo! api. My personal favorite is the Bay Area Traffic Cam – it’s not only cool to look at, it’s useful for everyday too.

Yahoo! News overlaid on a Map of the US:
http://maps.yahoo.com/Maps/V1/AnnotatedMaps?appid=akshayjava1&xmlsrc=http://www.csee.umbc.edu/~aks1/yahoonews1.xml

A crime-map for Potrero Hill in San Francisco:
http://api.maps.yahoo.com/Maps/V1/AnnotatedMaps?appid=potrerohillsf&xmlsrc=http://potrerohillsf.com/maps/data.xml

A map of San Diego Bloggers:
http://api.maps.yahoo.com/Maps/V1/AnnotatedMaps?appid=artlungmaps&xmlsrc=http://sandiegobloggers.com/newmap/data.xml.php

Milwaukee community generated neighborhood map:
http://api.maps.yahoo.com/Maps/V1/AnnotatedMaps?zip=53207&appid=bayview53207&xmlsrc=http://www.gobayview.com/map_yahoo/rss.php

Wineries and restaurants from the movie Sideways:
http://api.maps.yahoo.com/Maps/V1/AnnotatedMaps?appid=YahooDemo&xmlsrc=http://lucidit.com/test/sideways.xml

Bay Area Traffic Cam:
http://api.maps.yahoo.com/Maps/V1/AnnotatedMaps?xmlsrc=http://www.chrisyee.com/trafficcam.xml

We (SimplyHired.com, vertical job search engine) did a 'mashup' on our site where we combine social networking data from LinkedIn with our job listing data and related company metadata.

info here:
http://blog.simplyhired.com/archives/2005/04/simply_linkedin.php

More mashups coming soon.

- dave mcclure
www.SimplyHired.com

Glenbrook Networks recently launched a showcase of the fact extraction technology around the job listings vertical. This showcase includes a mashup of listings geo-positioned on Google Maps.
Here is an example: http://tinyurl.com/9dpdg

This graphs Southern California venture capital investments against Google Maps:
http://www.socaltech.com/intelligence/map/

The Supreme Court Zeitgeist offers a daily outlook on the John Roberts nomination...

http://judgejohnroberts.com

It's a mash-up site with popular bookmarks, recent blog entries, books & magazines, and other Supreme Court related links and content.

Real time map of Seattle 911 calls.

www.seattle911.com

One very easy way to create a Mash-up web sites is to use Web Integration, which is a special Browser combined with a powerful visual IDE that allows for very easy point-and-click connection to any data and logic on anything you can browse. Web Integration is already today used as the engine behind mash-up sites getting to more than 10,000 different web sites. I would like to know the general interest in making Web Integration easily available for anyone to create mash-ups?

Hi,

I seemed to have missed the boat a bit with this article, but here goes:

My company made this little app which finds out all the people in the Hot or Not database that live near you, and shows you their photos & bios.

Check out:
http://beammeuphottie.com