6. A computer-readable storage medium whose contents cause a mobile phone to perform a method for retrieving a media presentation associated with a rendered document, the method comprising: optically capturing an image of a human-readable text-based portion of the rendered document using a mobile phone; generating a digest of the captured portion based at least in part on content of the text of the captured portion; locating a document identifier associated with an electronic counterpart to the rendered document based at least in part on the digest of the captured portion; sending an enhancement package request including the document identifier to a media server; receiving from the media server an enhancement package associated with the document identifier, wherein the enhancement package includes multiple media presentations associated with multiple words of the rendered document, wherein each word of the multiple words is associated with a respective media presentation of the multiple media presentations; optically or acoustically capturing another image of a human-readable text-based portion of the rendered document; locating within the enhancement package a media presentation associated with one or more words identified within the another captured image; and presenting the media presentation via a display of the mobile phone.
6. A computer-readable storage medium whose contents cause a mobile phone to perform a method for retrieving a media presentation associated with a rendered document, the method comprising: optically capturing an image of a human-readable text-based portion of the rendered document using a mobile phone; generating a digest of the captured portion based at least in part on content of the text of the captured portion; locating a document identifier associated with an electronic counterpart to the rendered document based at least in part on the digest of the captured portion; sending an enhancement package request including the document identifier to a media server; receiving from the media server an enhancement package associated with the document identifier, wherein the enhancement package includes multiple media presentations associated with multiple words of the rendered document, wherein each word of the multiple words is associated with a respective media presentation of the multiple media presentations; optically or acoustically capturing another image of a human-readable text-based portion of the rendered document; locating within the enhancement package a media presentation associated with one or more words identified within the another captured image; and presenting the media presentation via a display of the mobile phone. 8. The computer-readable medium of claim 6 , wherein optically capturing an image of a text-based portion of the rendered document includes capturing an image of textual elements and non-textual elements within the rendered document; and wherein generating a digest of the captured portion includes identifying characters of the text within the captured image.