Google has launched SSL search for its web based search & image based search. Till now, when ever u searched anything over internet, ur ISP would get to know exactly what were u searching. But, when u will be searching through SSL search, all the search word that u will type will get encrypted & than it would be sent over the internet so now ur ISP will get to see only the encrypted search item which they won’t be able to decipher.
U can search securely through following url https://encrypted.google.com/
For more information, you can http://www.google.com/support/websearch/bin/static.py?hl=en&page=guide.cs&guide=1224171&answer=173733&rd=1
Firefox has added a add-on for Firefox which will always search in secured way. You can download & add this add-on from below mentioned link