GeoRSS for Google Maps
GeoRSS is an effort by several OGC types, among others, which in time, may become an approved standard. GeoRSS allows geographic tagging of RSS in a standard way, based on a (very simple) profile of GML. (I consult to OGC.)
Mikel Maron, who is behind it, notes that Yahoo and worldKit support GeoRSS and now challenges Google to do so, too. Cool!