In WordPress 3.5, there’s no more option to set the width and height of oEmbed-embedded media (Youtube, Vimeo, Flickr, Twitter etc) in the admin interface. The max width is now automatically the width defined in the functions.php of your theme:
if ( ! isset( $content_width ) ) $content_width = 600;
600 in the above code to whatever the width of your main content area is in pixels. More info about the change on WP Beginner.
The latest WordPress 3.3 includes a fix that removes the performance problems related to using just /%postname%/ as your permalink structure without any prefixing dates/numbers. According to Joost de Valk, using dates in URL’s can result in poor click-through-rate, so I thought I’d go ahead and make the switch.
Check out the instructions on Joost’s blog. He also has a nifty tool for generating the necessary .htaccess redirects.