See For Yourself
Today, the British Library released the first glimpses of the Codex Siniaticus: the Gospel of Mark, Psalms, Esther, Jeremiah, parts of 1 Chronicles, and several apocryphal books. The site has search and zoom features, translations and transcriptions of the original text, and different lighting choices to highlight characteristics of the ancient parchment.
When I checked moments ago (7:50 am) the site was too busy to let me in for a peek. I'll keep trying.