Mash-Up has to be the Web 2.0 “Word of the Year.” For those of you not in the know, a mash-up is the combination of two existing web services to create something new, wherein the whole is greater than the sum of its parts.

Here are some of my favorites…

• Neighboroo They have injected a mapping interface with Steroids! Punch in a zip code and discover if the air is breathable, your likelihood to be mugged, and how much it can cost to live in such an area (and much more!). If you like demographics, this site will satisfy your fix.
• HitTail Think Google AdWords….now, Mortgage = Short Tail….Wholesale Par Interest Rates = Long Tail. A Popular Short Tail = Mucho $ per click. An’ Unknown’ Long Tail = like $.02 per click. HitTail discovers and recommends your sites potential Long Tails. Solid Play!
• TransparentRE Timely and rich postings from guy who ’sees’ what is happening in the world of real estate. For the newbie to the seasoned professional, Pat’s content and links are must read material.
• The BloodHound Blog The most progressive thinker regarding the evolution of, and solution to, traditional Realtor agency models. Greg Swann is ahead of his time and a posting MACHINE. maybe one day he will link to me too…psst Greg…
• The Future of Real Estate Marketing The Neo of online real estate tools and resources…I think Joel is somehow hardwired into the Net…
• Altos Research All I can picture is a guy in a room processing an incredible amount of analytical data across 3 monitors. Its not about the sticks and bricks here, all about the numbers.
• Seth Godins Blog. A marketing deity. I find myself repeating his kernels of wisdom in my head during times of marketing duress…it’s weird.
• Grow-a-Brain. Don’t really know how to describe this site, except that I get lost for hours in there, chasing the cornucopia of bizarre topics…often find myself saying ‘wow, I was wondering about that’…
• GMap Integrate your own data into a Google Maps Mash-Up. Very cool (thx to Pat again)