These were mentioned on the Reformed Baptist List and are very good.

Sabbath: A Day to Keep.
By J. C. Ryle
Remember the Sabbath Day, to keep it holy.- Exodus 20:8.


A. W. Pink
The Christian Sabbath

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R. Martin Snyder
1689erPuritanCovenanter MSN Blog
Harmony Baptist Church (Member)PuritanCovenanter's MySpace Page
"Our object should not be to have scripture on our side but to be on the side of scripture; and however dear any sentiment may have become by being long entertained, so soon as it is seen to be contrary to the Bible, we must be prepared to abandon it without hesitation."William Symington