Riak has the ability to select keys for processing via various queries, including range of the key.
Riak also has secondary indexes and full text search.
If there's something significant about the DynamoDB method of doing range scans I'm interested in hearing it. My purpose here isn't so much to bash DynamoDB (in fact, I don't want to do that at all) but to try and spread a little more awareness of Riak.
Riak really came into its own in 1.0.
Based on the resources I can find online, any select-by-range operation in Riak requires broadcasting to all nodes (or at least enough nodes to hit at least one replica of each record), and then performing a scatter-gather operation to fetch the matching records. There also doesn't seem to be any way to specify a sorting order. This is not quite what I would call a range scan: while useful, it presumably doesn't have the same cost or scaling characteristics. It's the difference between scanning a block of data that is stored contiguously, and filtering through an entire table to identify records meeting a criterion which happens to take the form "a <= value <= b".
This is not to diss Riak, which is a nice piece of work and does many things that DynamoDB doesn't.