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Sharding is use with replication to provide failover. This will be more automated in the upcoming sharding beta.

Key storage in the document objects make it more 'schemaless' which is actually incredibly useful; the document format (BSON) is efficient. In practice that works just fine. Try it out sometime on a test project?

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Well I'm pretty much compelled to try at it this point. The reviews around here are pretty stellar.

Do you think that MongoDB would perform well on a shared environment like a Linode VPS? Does MongoDB have any sort of resource gotchas like "oh, you need at least 512MB RAM for the thing to even start up" or the like?

it can run in a very small footprint. the one gotcha is that as it uses memory-mapped files, you need 64 bit OS for multi-GB databases.

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