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Ole Rømer Museet
http://www.oleroemer.dk/
Copenhagen museum about his works in astronomy.
Roemer, Ole
http://64.1911encyclopedia.org/R/RO/ROEMER_OLE.htm
Article from the 1911 Encyclopedia Britannica.
Rundetaarn: Centuries of Astronomy in Denmark
http://www.rundetaarn.dk/engelsk/observatorium/history.htm
Includes section on Rømers works.
Wikipedia: Ole Rømer
http://www.wikipedia.org/wiki/Ole_Romer
Short crosslinked encyclopedic article.