I'm currently running OS X 10.7 Server Developer Preview 1... is it just me or is there no Server Developer Preview 2 available? It's not on the main page and it's nowhere to be found on the complete list of available downloads either.
I can imagine myself becoming hopelessly stuck if I load the client version of DP2 on top of the server version of DP1. Has anybody tried this? Has anybody noticed whether they've made an announcement somewhere?
There's no mention of it in the seed's changelog, as far as I can see...

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If your a developer, please file bugs on this. This is a stupid decision AFAIC...
It might be a "stupid decision" though that's arguable. (I will argue against it briefly.) It certainly
isn't what filing bug reports is for, as it isn't a bug. One files a bug when one encounters behaviors that do not conform to the expectation created by documentation or by reasonable presumptions about use, or when there exists a fault that renders a machine unstable and/or inoperable. The
decision to make Notification Centre not interoperate with non-AppleStore apps is none of the above, and therefore filing a bug report is the wrong way of "protesting".
(As for protest, we all know Apple couldn't care less what we think, and that they made this decision knowing it would likely be unpopular.)
Now, turning to the matter itself, consider this: Apple is enforcing Sandboxing as a pre-requisite for AppStore status. Simultaneously it is allowing Notification Center access to AppStore apps only. This means they've very consciously set up a set of incentives to offset the onus of complying to the Sandboxing policies.
If you think about it, all-and-sundry access to the Notification Center could be extraordinarily annoying. Think of the potential for spamming, how annoying it'd be if a small random application you downloaded from Wherever could serve as a conduit from some third-party Spamhaus to your Notification Center, (at worst) inundating you with Viagra spam or (at best) acting as a Groupcon shrill.
No, it's not a smart idea at all. Apple is being prudent and is protecting the end-user's experience by making a decision that has some upside in exchange for some downside. That's the essence of decision-making, it's all too easy to make only those decisions that carry no disadvantage.
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Moderators, the above user clearly made comment (that is against all reviews of the iPad) in an attempt to cause trouble.
I request this behavior is dealt with.
Just be cause he disagrees with you (and almost everybody else) doesn't mean s/he deserves to be "dealt with". That's the essence of freedom of expression. How about we "deal" with all those who took the bait and disagreed with him/her instead? Oh no... that would be "unfair"...