>How to I create documentation for a method that appears in the Object Browser?

In C#, hit /// above the method and it will create an XML comment that you can fill in (VB uses three single quotes, '''). This shows up in the Intellisense and docs. There are various XML tags that you can use inside the XML comment if you want to get fancy or want to generate real docs (ex. MSDN style) from your classes - <remarks>, <para>. <see> <seealso> etc.