Postcode maps
Postcode maps is a Smart Tag for Microsoft Office that recognises postcodes and allows you to open Google Maps or Multimap centred on the postcode. According to the Smart Tag documentation, it should work with both Office XP and Office 2003 but I have only been able to test it with 2003.
Download Postcodes.xml and save it to <drive>:Program Files\Common Files\Microsoft Shared\Smart Tag\Lists. You will need to close any office applications before the Smart Tag will be picked up.
This is a very simple Smart Tag using Smart Tag Lists. Read