I think it is becoming apparent that many of us are using 1.5 and we have similar expectations about its functionality as we do with 1.2.2. This is WRONG.
It's been said many times that using 1.5 may cause headaches and be a royal PITA at times. This has proven to be the case. This should not come as a surprise to anyone with experience working with beta version software.
I think that we need to understand that when using 1.5, our energy should be focussed on finding issues in the core/default applications.
A lot of effort is going in to help people who are already implementing hacks and plugins and all kinds of customization into a WP version that is still very much in flux.
There are issues that are definite bugs with the default install. They need to be addressed; however, the amount of noise going on around 1.5 is starting to make things unproductive in this forum. Speaking strictly for myself, I will no longer try to support any issues with 1.5 that are not related to a default install. We need to find the bugs, and have the code developers working on those things, and not being bothered by "how do I get my hack/plugin to work?"
WordPress is unlike most projects I have ever been involved with. There are no limits on access to version updates. SixApart had a controlled, and LIMITED beta program for TypePad. I was a part of it, in fact. My point is that the open-door policy of WP and its alpha/beta/release candidate versions is a blessing, but it's not without it's pain.
Anyway, I had some time on my hands, so I thought I would just ramble on for a bit. :)