Google have added a new feature recently which allows you to hide 'Sign In, Recent Changes or the Print Page' links from the automated Google Sites System Footer.
Just log into your site > More Actions > Site Layout > Customise System Footer Links > decide which links to hide (unfortunately you can not remove them all just the ones I mentioned earlier but it's a start!) > click ok > click save changes
Let me know if you have any problems.
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Beckystar aka Web Princess