Change the Default Screen Capture format in OS X
Victor over at DownloadSquad had asked me a while back if I knew of any way to change Tiger's default screen capture format to something other than PNG. I think I said that I'd look into it, but I never did.
Fortunately, Victor has gumption and went out there and found something on his own: SCIT (Screen Capture Image Type). This Tiger-only free app lets you switch the default screen capture format between BMP, GIF, JPG, JP2, PCT, PDF, PNG, PSD, and TIF, and it does so immediately with no need to log out and log back in.
Meanwhile, what's wrong with PNG?