While we were all glad to see that WordPress now supports embedding of GitHub gists, it seems like the current implementation is a bit fragile in terms of formatting.
I am drafting a post containing a few gists and layout is completely broken. You can experience the issue also by visiting the official support page: http://en.support.wordpress.com/gist/ (source code in gists is centered).
Ideally, it would be great if the embedded gists would be wrapped in an element that resets the CSS that messes up.
here’s a screenshot of my post draft: http://i.imgur.com/GKBrk.png (the problem is that the code font is smaller than the one used for the line numbers, that are therefore not-aligned). This in particular is due to the WP CSS font-size specification for pre prevailing on the one in gists.