Get it here.
This beta encapsulates some changes I made that I wanted to get out before the final release. I will likely finalize the final release Tuesday night or Wednesday, so please let me know if you have any issues sooner rather than later. There are some tweaks to HTML export, the first-launch experience is fixed, and the "Save As" menu item will now worked more as expected when used on the main document. There is also a workaround for a crash in the OS with URL caching. Please let me know of any troubles.