It would seem that some people were busy programming over the Easter holidays:

• Brian Flood and his team have released a trial version of Arc2Earth, the pro application for turning ESRI ArcGIS-authored content into KML. No more excuses!
• Tim Beerman, meanwhile, is up to Beta2 for Shape2Earth, an open source GIS shapefile to KML converter. I don’t know if there are more beta testing spots available, but you can try via here.
• Also just updated: R.S.Grillo’s GE-Path, a free windows application that enhances paths made in Google Earth. (Note that installation is not straightforward.) Check out GE-Graph too, while you’re there.