As a webmaster you might know that the search engine
Google does an update mostly once a month. Several
days before the updated database is available at
www.google.com you can get a preview of the new data
index at www2.google.com and www3.google.com. While
that update period the search results vary from time
to time so the update got the name Google Dance.
To compare the results of all three servers at a glance
there exists several tools on the web which show the
result pages of Google side by side or one below the other.
The Google Dance Tool on this site, that you can download
and use for free, shows a permanent entry field for the
search terms and the buttons to select the horizontal and
vertical frame structure.
For webmasters in Germany might be interesting the possibility
to compare the search world wide, pages in German and pages
from Germany side by side.
The result pages can be displayed two different ways. First in
three columns [ ||| ] to compare the positions of the
results. And second in three rows
[ ]
to compare the number of results.