Google Australia is running a treasurehunt http://google-au.blogspot.com/2008/05/google-treasure-hunt.html

The URL with more details is apparently related to this string:

aHR0cDovL3RyZWFzdXJlaHVudC5hcHBzcG90LmNvbS8=

and perhaps this

1210550400

Not wanting to be a spoil sport... but it doesn't show anything just yet anyway: http://treasurehunt.appspot.com/

It might on the 12th of may at 12am

Tony : you are right, it was base64 encryptation

The number is a UNIX timestamp date that maps to

1210550400 = 05 / 11 / 08 @ 8:00pm

The url is quite easy to decode, and I am quite sure that 1210550400 is some kind of time notation, but I forgot which one (tried two already)

I got stuck with the first question I got... anybody else tried it?

spreadsheet program...
for 3*4:

   | A | B | C | D |
-------------------------------------------------
   1 | A2+B1 | B2+C1 | C2+D1 | 1 |
-------------------------------------------------
   2 | A3+B2 | B3+C2 | C3+D2 | 1 |
-------------------------------------------------
   3 | 1 | 1 | 1 | 1 |

http://googleblog.blogspot.com/2008/05/google-treasure-hunt-update.html

Python is going to be pretty useful here...