I was playing around in Aptana (a code editor) and was desperately trying to get the cursor to the end of the line. In Windows, pressing then End key does that (and Ctrl + End takes you to the end of the document).
Not in OSX though.
I tried Command + End, Control + End, Option, Shift, and just about everything else I could think of.
Command + Right Arrow!
And obviously (once you know that) Command + Left Arrow takes you to the start of the line.