Nov 30 2011
Apple has released version 5.1.2 of Safari, now available in a Software Update near you. The new version, according to the notes, increases stability, fixes a few issues that could cause hangs and memory leaks, and fixes an issue that would allow web page to flash to white. No more more freaky strobes when loading up a new URL, hopefully.
The patch also allows web pages to show PDF content right inline with the rest of their web material, which is a nice option for programmers who need to show content that way. Safari 5.1.2 is a 40.2 MB update, and does require a restart.