This site allows you to insert your data (whether or not it is geocoded) and allows you to use a webservice to query the data eith by searching geospatially (by distance from a central point) or by maxmimum bounding rectangle/MBR (finding all points within a rectangle as you may want to grab everything located within a rectangular map).
To get started, go to the setup section. It is a 3-phased creation:
Detailed instructions and documentation are available here.
...and remember, it's free!!!
Please make sure to provide feedback!!!