A portable device having scanning, imaging or other data-capture
capability is described. In some cases, the portable device can indicate
to the user when enough information has been captured to uniquely
identify a source document. In some cases, the portable device calculates
timestamps and location-stamps indicating when and where a data capture
occurred. In some cases, the portable device is controlled by gestures.
In some cases, the portable scanning device has associated billing and
content/service subscription information.