Google.com correctly detects that my ISP is located in Israel, and it's default behavior is to connect me to www.google.co.il. I was able to connect to www.google.com rather than www.google.co.il by adding the following line to my etc/hosts file.
74.125.45.100 www.google.co.il #redirect google.co.il to google.com
Under windows Vista, the etc/hosts file is /Windows/System32/drivers/etc/hosts. While this currently works perfectly, a weakness to this solution is that if Google.com changes its IP address from 74.125.45.100 to something else, I will have to manually re-edit the etc/hosts file.