This project is no longer actively developed or maintained.
For new work on this check out Python Query Cursors
"Suggestion Box" is an example application that covers two different approaches to paging through result sets in Google App Engine datastore queries.
The first approach ("Unique") manually creates a unique value for each suggestion in submitted and uses that to query on when paging.
The second approach ("Cursor") simply tracks the timestamp when each suggestion was submitted and uses a datastore cursor returned from each query to page through the result set.