Mike Blumenthal shared an incredible tip at SEMpdx SearchFest 2011 regarding creating a shortcut to Google Reviews input box.

Shortcut to your Google places page:

http://maps.google.com/maps/place?cid=17890642534106265499

You can truncate the very long, awful main URL.

Better still, link directly to the input box for reviews:

http://maps.google.com/maps/place?cid=17890642534106265499&dtab=2&action=openratings&ct=write-review

Note the addition of &dtab=2&action=openratings&ct=write-review

Awesome!