Instead of just using
http://www.google.com/
http://www2.google.com/
http://www3.google.com/

you can type in the URLs to all of Google's Databases:

• http://www-ex.google.com/
• http://www-sj.google.com/
• http://www-va.google.com/
• http://www-dc.google.com/
• http://www-ab.google.com/
• http://www-in.google.com/
• http://www-zu.google.com/

what are the www-??.google.com ? what are they used for by google?

this could be really useful for me to know in order to use them more effectively, and i'm sure it would help out other people as well

many thankx