This is best explained here: http://code.google.com/appengine/kb/postpreviewpricing.html#operations_charged_for<http://www.google.com/url?sa=D&q=http%3A%2F%2Fcode.google.com%2Fappengine%2Fkb%2Fpostpreviewpricing.html%23operations_charged_for> Small operations are neither reads nor writes, but are key allocations, returning keys from a query, or counts. Your "Billing History" usage reports can tell you if you are using a substantial number of these operations now.
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