I received this from the moderator of this forum, not a site, but both PDF-files are very to the point, with explanations accompanied by formulas to prove things and let you find out yourselves.

Quote :
"However, this paper, by Davis and Lineweaver, provides a good, succinct account of some popular misconceptions of modern cosmology.

Davis and Lineweaver have also written a less technical account. It was published in the magazine Scientific American, in March 2005. However, you can get a (PDF) copy from Charles Lineweaver's webpage - click on the link to it (it's at the bottom of the webpage).

If you don't understand anything in either, please just ask.

I think that you should first understand the basics of the "Big Bang" theory, before trying to understand how Dark Energy fits into the concordance model