The new Ubuntu 10.04 is really nice, IMO, but there's this one odd thing about it -- they moved the window buttons to the left side, and once you've learned the other way, it's pretty frustrating.
Here is how to fix that:
open a terminal --
at the prompt type gconf-editor and a gui will pop up.
Navigate to apps->metacity->general in the tree view
Change the value of the button_layout to menu:minimize,maximize,close
You do that by double clicking the existing entry and you'll get an edit box to type into.
And that's it. I'm supposing you need to run gconf-editor from a terminal because you can really mess things up with it, kind of like with the windows registry, so most users shouldn't fool with it, and
it's not in the default application menus. This is one of the very few things you actually need a terminal for in this version, though you could add it to the gui menu if you were going to fool with it a lot.
So far, this seems to be the "hairy arm" or "naked lady" in this version -- everything else seems quite nice to me. I have now installed it in several machines, old and newer with nothing but having to tell it the language, timezone, and how much disk it can have, and everything from wireless to web-cams "just works".
I have heard you can have some troubles with huge files when upgrading from really old versions though -- YMMV, but I like these long term support versions, and may not upgrade my older "main" machine at all -- it "just works" too.