Even I can. GitHub and Gists are all accessible from where I am.
i tried to push some code and was getting DNS resolution errors so i started using google DNS, now everything works.
Same here. Tried accessing github and sourceforge didn't work, switched to google DNS, works like a charm now. Not sure how they are blocking the sites.
Here in Kerala github.com is up and running but gists.github.com returns "Connection interrupted"