Doc comment for DB.Driver says DriverDatabase, should say Driver.

ScanInto and ScannerInto are awkward names in a public API.  Maybe this operation
can be called Load?  Also name the argument src to make clear that
the receiver is the destination.

// A Loader can initialize itself by loading data from a driver.Value.
type Loader interface {
    Load(src driver.Value) error
}

ErrTransactionFinished -> ErrTxDone.

The Stmt.QueryRow example should say Scan(&name) not Scan(&s).