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This is intentional. We can either have a rule to remove all HTML comments (preferably using Tidy) or you can use reReplacer by NoNumber to accomplish the same thing. Which option do you think is better?

I prefer Tidy as well. My only concern is the processing overhead, especially taking into account that Joomla! 1.5 does no caching for logged in users. I plan on implementing that feature when Joomla! hits 1.8 and we all have to migrate to the new system with a much more improved page caching (therefore mitigating the Tidy overhead).

I assume that you want to remove Javascript comments. That is impossible. Javascript is a strange beast. You can't do that with regular expressions, you need a tokenizing parser to do that and that is impossible to write in PHP. It's also impossible to run it per page load, as the performance impact is extremely high.

I know about the login... The problem is mooTools (surprise!). I need mooTools 1.2 for Akeeba Subscriptions to run. K2 uses 1.11 and always loads its Javascript. I am just being patient at the moment, as K2 2.5 drops mooTools and uses jQuery, which is FAR EASIER to tame - and much less likely to cause incompatibilities.

It's quiet, yes! I think that my efforts with the forum's operation had effect. If you are not a subscriber you can no longer cross-post, you get a huge warning to read the documentation (with links!), you can't reply to your post in less than 8 hours and you can't write on more than 2 threads per week. These restrictions force users to actually read the documentation and, surprise, solve their issues without posting on the forum. As I have already said, unless you force people to read, they won't. If you do force them, they will actually thank you for providing a great troubleshooting guide :)

I've experimented with some techniques. CSS combination and minification works wonders, albeit it takes very long to generate the minified files (good think there's caching involved!). JS minification is impossible due to the need of a tokenizing parser.

And here's the icing on the cake: you do not need JS minification! You can't combine JS files (without screwing the whole lot of pages). So, it's far more efficient to just GZip the JS files, like what .htaccess Maker does.

See my point? ;)

FYI, they are already scheduled for Admin Tools 2.2, as you can see in the ticket tracker (tickets #8 and #9) ;)