The other day I decided to incorporate some of the fantastic links I have stored in my "goodie bag" and create a search utility that indexes only mashup and map mashing related resources. The results so far are very good and will enable you to easily search and locate mashups on any topic you like. Looking for a New York mashup? no worries.. how about beer or maybe sexual predators... no problem. Check it out and feel free to send me your favorite "mashup" links and I'll be glad to add them to the DB - Jump to the Mashup Search Utility HERE - somewhat related you can also try the GISuser Search Engine (4000+ sites indexed) - an awesome tool for locating free GIS data and quality hand selected GIS resources!