One question that I see come up quite a bit is how to remove the xsd and xsi namespaces from the XmlSerializer output.

The easiest way to do this is to use an overload of the Serialize method.

StringWriter sw = new StringWriter();
XmlTextWriter tw = new XmlTextWriter(sw);

XmlSerializerNamespaces xsn = new XmlSerializerNamespaces();
xsn.Add(String.Empty, String.Empty);

XmlSerializer serializer = new XmlSerializer(typeof(MyObject));
serializer.Serialize(tw, myObject, xsn);

According to Reflector, the main Serialize method checks if the XmlSerializerNamespace instance is null or has a zero length. If either are true, it uses a default XmlSerializerNamespaces instance which includes the xsd and xsi namespaces.

This little tidbit helped me remove the cruft from my XmlSerializer output. Hopefully it helps you do the same.