The first step in scaling is creating Replica sets (master/slave) where the slaves are allowed to service queries. This will be helpful for read-mostly workloads.
After that, the next step is sharding, where you'll need to define a partitioning mechanism. At a very large scale, the topology would be that of multiple shards, within which contain individual replica sets.
Link: http://www.mongodb.org/display/DOCS/Sharding+Introduction
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