I received OS X Tiger today, as promised by Apple. First impressions:

* Ideally, you need to renice the mdimport processes once you first install. They'll take up quite a bit of CPU for a couple of hours while they index your entire hard drive.

* Dashboard is very, very, very cool.

* Dashboard widgets are highly Americanized. The Yellow Pages one doesn't work for England, the weather one only seems to do London or US towns,

* No animations on Dashboard weather widget on my Mac Mini or iBook. I guess this is a CoreImage issue with the lesser graphics cards these machines use. Shame really. Some transparent animated PNGs would have done the trick.

* No ripple effect when placing Dashboard widgets on my Mac Mini or iBook. Same issue as above, although luckily I don't like the ripple effect anyway.

* Mail is a lot faster. Mail is 100x better. Mail is.. great.

* Safari feels the same. Still lacks ability to drop down and change between multiple search engines. Might be a little faster.

* /etc/hosts and /etc/httpd.conf are refreshed to defaults, luckily I kept backups.

* The general look and feel is a lot nicer. Still a mixture of styles though between the 'plastic' and 'metal' apps.

* Smooth scrolling is overrated, and you seem to need to turn the scroll speed right up to get back to similar scrolling speeds as before.

* Yay! A "Programmer" mode with Hexadecimal, Octal, and Binary in Calculator.

* Improved download status in Safari.

More as I get em. I'm only two hours in, and I think the Spotlight metadata import has finished, so I can try all that love out now.. :)