Can anyone manage to zoom in on the maps? I can't seem to do it.
click for instructions

http://www.trendhunter.com/trends/super-close-google-maps

It does what it says.

What, exactly, are you trying to do?

Trying to zoom in, it is this bit i don't follow

Replace the number after the “z” parameter in the URL. The higher the number, the closer the zoom. Most of the super close zoom areas are mapped between 20 and 23.

Works fine to me..

Edinburgh Zoo - Zoom level 20 (more than max zoom level)

Penguin Pool ;)

http://maps.google.co.uk/maps?f=q&hl=en&q=Edinburgh+Zoo&layer=&ie=UTF8&om=1&z=20&ll=55.944094,-3.271777&spn=0.000436,0.001385&t=k

there isnt detailed zoom coverage in many areas yet, could be that the are you want to look at isnt in high-res yet.