Downloading Google Search History

You can use bookmarklets like
Geeklad's script

or you can do it manually with by entering the following into your browser

Generating QR Codes with Google

The google chart API has this feature.
http://chart.apis.google.com/chart?cht=qr&chl="+[YOUR_TEXT]+"&chs=[XSIZE]x[YSIZE]"

For instance
http://chart.apis.google.com/chart?cht=qr&chl="Hello World"&chs=120x120"

will generate this

Changing the default google domain in Chrome

On a mac, make sure that you closed the Chrome browser.

Go to

cd ~/Library/Application\ Support/Google/Chrome

and edit the 'Local State' file,
change the following lines to whatever google domain you want.

"last_known_google_url": "http://www.google.com/",
"last_prompted_google_url": "http://www.google.com/",

start the browser.

If you use profiles you have to go to that profile folder and change the 'Local State' file there
cd ~/Library/Application\ Support/Google/Chrome/[PROFILE NAME]