I took an Ancient Egyptian Civilization course last fall and had to write a research paper. When I asked my professor (Kara Cooney for anyone in the know) where to go for translations of ancient sources, she gave me this site: http://www.reshafim.org.il/ad/egypt/texts/index.html

I cannot personally attest to its validity but considering it was recommended to me by my professor I would not hesitate to use it again in the future if need be.

The Electronic Text Corpus of Sumerian Literature, which is made and maintained by the University of Oxford, is available at http://etcsl.orinst.ox.ac.uk/ in case you have any interest in cuneiform translations.