VIM substitution to prepare XML code samples for HTML blogs

I sometimes need to include XML code samples in my blogs.  When I do this I need a quick way to format it for HTML, more specifically, format it for whatever blogging software I'm using.  Since it is infrequent I just use VIM substitution (I know, I could do this in SED but for now VIM is good enough)

From http://vim.wikia.com/wiki/Search_and_replace:

:%s/foo/bar/g
Find each occurrence of 'foo' (in all lines), and replace it with 'bar'.

I search for < or > then replace them with < or > and done.

:%s/</\&lt\;/g to replace all instances of < with <
:%s/>/\&gt\;/g to replace all instances of > with >