they have a bit of competition now http://www.oncetechnologies.com/radix/ http://www.oncetechnologies.com/radix/ http://www.aphplix.org/ http://www.aphplix.org/

they have a bit of competition now http://www.oncetechnologies.com/radix/ http://www.oncetechnologies.com/radix/ http://www.aphplix.org/ http://www.aphplix.org/ probably 100's of others (probably not as good though). Dabble db is pre web2.0 though.