There's nothing that screams to me "must get immediately". Time Machine looks pretty cool, but I'm a little nervous about my co-workers abusing that feature to the point of frustration (for me, that is). IMO, Spaces is something that should have come with the first edition OS X.
While I am sure there are some bells and whistles worth having eventually, I think waiting few months isn't a bad idea. No matter what, it can't be worse than that other operating system.
And for what its worth, the new version of Ubuntu is pretty cool. I'm actually more excited about that upgrade.
Are you sure this is abnormal? The search box opens for me when I hit the apostrophe key too. I've always thought it was a built in feature on Firefox. Of course, if I'm typing in a search box (or on the W), then it doesn't turn on.