I upgraded my system to Snow Leopard from Tiger, and noticed that Snow Leopard adds a date and time stamp to screen shots' filenames. I really don't care about this new feature, and wanted to remove it. After a bit of a search, I found the solution.
Type (copy) into Terminal:
sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /System/Library/CoreServices/SystemUIServer.app/Contents/Resources/English.lproj/Localizable.strings
/* Format screencapture file names */ "%@ %@ at %@" = "%1$@ %2$@ at %3$@";Between the quotes on the right side of the equals sign is the date and time addition. Just edit it, something like this:
/* Format screencapture file names */ "%@ %@ at %@" = "Screen Shot";Make sure to not leave this empty! Using the above example, the first screen shot file will be named Screen Shot, and then Screen Shot 1, Screen Shot 2, etc.
killall SystemUIServerNote that I tested this only on Snow Leopard.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20091228142521881