I just finished up a placefile generator for Weather Underground personal weather stations.
I've posted a screenshot.
EDIT:
I've added the functionality that rrick8 on the GRX Owners Forums asked for. It actually wasn't that hard.
So, to use MULTIPLE weather stations with this, just stick a comma between each Station ID
Here's an example.
http://www.w8css.net/sandbox/wunder.php?wid=KMIBRONS2,KMIBATTL5
As you can see, I'm fetching data for both KMIBRONS2 (Bronson, MI) and KMIBATTL5 (Battle Creek, MI)