weather.com has changed its layout since 1.4.8 so it's not possible to add many cities. This is an update of some the matched strings in weather.xml. To use, replace /Applications/Meteorologist.app/Contents/Resources/weather.xml with the attached file.
Unfortunately, the string matching produces some false positives (including blank entries), but these can be safely ignored.
Tested with the following city entries: "London", "Paris", "New York", "San Antonio", "Seoul", "Melbourne" on 11 November 2009.