There are some things I've just gotten used to doing in Windows that I cannot find the keypresses for in OS X.

For example:

In the mail app I want to go to the top of the message list. In Outlook I'd use the Home Key. Mac Key: ?

When editing text:
In Windows, go to next word is Ctrl-Right Arrow. In Mac?
Select next word: Ctrl-Shift-Right Arrow.
Go to the beginning/end of the line: Home/end - mac?
Execute highlighted Icon - Windows: Enter. Mac? Enter renames.

I'll come up with some more, but these are the items I'm having the most difficulty with right now.

Thanks!
Jeff