Even though it has been said on another place or two on the web: To show hidden files (like .profile etc.) in Finder use
defaults write com.apple.finder AppleShowAllFiles TRUE killall Finder
With FALSE instead of TRUE it’s switched back to the original state. However, I like working with PathFinder which can be configure to show these files (and it does a whole lot more).
And screen shots are done with Shift-Cmd-3 for the whole screen and Shift-Cmd-4 to get a cursor to define an area to take the screen shot form.