Mechon Mamre
Hebrew English Bible: Lamentations
The text of the Book of Lamentations, presented side-by-side in Hebrew and English.
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Ray Stedman: Adventuring Through the Bible
"Adventuring Through the Bible" is a comprehensive guide to the entire Bible with Bible commentary. This site is an excellent place to start if you are new to the Bible and/or have questions about evangelical Christianity.
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Believe: Book of Lamentations
A good overview of the book of Lamentations that discusses its main theme; also includes a section on more "Advanced Information" which includes the Jewish perspective.
Other
Matthew Henry's Commentary: Lamentations 1
An overview of the entire book of Lamentations and then chapter by chapter overviews given by Matthew Henry.