Mashup let you create QR-code for direct map loading and HTML fragment for placing that QR-code on site (blog, etc.) So, it is a tool that helps you create and distribute mobile maps. Type (size) for map could be configured.
By default, mashup will ask about location for the map (area that should be used for creating QR-codes). You can directly describe geo area you are interested in. The basic URL can proceed the following optional parameters:
lat - latitude
lng - longitude
zml - a zoom for the map (by default it is 14)
For example: Mobile Maps for San Francisco