This comes courtesy of macosxhints and is definitely in a list of things
I plan to do in the morning. 

*** Disable Shadow In Screen Window Captures *** 

In Leopard, there is a shadow around whole-window during screenshots (ie,
Command-Shift-4, Space). This can be disabled from Terminal with this command:

defaults write com.apple.screencapture disable-shadow -bool true

To make the changes take effect, logout and login, or restart SystemUIServer. 

[robg adds: This works, and I activated it with killall SystemUIServer in Terminal. To add the shadow effect back in, delete the newly-added pref: defaults
delete com.apple.screencapture disable-shadow, then restart SystemUIServer again.]

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*** Set Help Window to NON FLOAT ***

he following Terminal command will revert the Help Viewer window to its “not
always floating” 10.4 behavior:

defaults write com.apple.helpviewer NormalWindow -bool true

Additionally, execute the following (bash) commands as an administrator in Terminal to have access to the application via Command-Tab or its Dock icon:

i=/System/Library/CoreServices/Help\ Viewer.app/Contents/Info.plist sudo defaults write "${i%.plist}" LSUIElement 0 sudo chmod 644 "$i"

Sources:

[robg adds: This hint makes the second half of this previous hint (which required hacking the Help Viewer executable code to change the window behavior) irrelevant.
There's still some good info in the previous hint if you'd like to not only gain a dock icon for Help Viewer, but also change the window's behavior (by editing its .nib file). For most people, though, I suspect the simple Terminal command in this hint will be sufficient. I went through the Help Viewer binary files in the 10.5 release, and I honestly don't recall seeing theNormalWindow string
anywhere, so this may be new in 10.5.3 (or I just overlooked it with the earlier release).] 

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*** Show All 64 bit apps using terminal ***

#
For Intel: locate -0 app/Contents/MacOS/ | xargs -0 file | grep x86_64

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