This isn't the first time that the Views Module has spit out invalid code. It's not a huge issue, but I've seen Views spit out div blocks without a close tag, just causing me all kinds of headaches in IE.
While trying to do some ahah uploading for a 5.x Drupal module I'm porting to core 6.x, I discovered some problems with my local 32-bit apache setup on my Mac OS 10.5 development machine.