MoliUbiquity: GeoIP
Please make sure you are using Firefox 3, with Ubiquity installed. Otherwise, nothing happen.
(For those are new to Ubiquity, you can visit its tutorial. Type about:ubiquity in your browser navigation bar to change your hot-key for triggering Ubiquity. Enjoy!)

geoip: GeoIP tracing
preview: Display the GeoIP information of given IP/domain, or selected text.
execute: Prompt the GeoIP information with message of given IP/domain, or selected text.
reference: hostip.info
geoip (IP/domain)