This qualifies as an annoyance more than anything. But on my install, I've noticed occasional delays in the edit/post section after finishing a post. The submit/post/blog button just hangs. Interestingly, even though it doesn't go to a new page, it actually has successfully made the post (I can clearly see it on the View Site option).
If I hit the button more than once, then I will see multiple versions of the post repeated on the weblog. Anybody seen this?