One Quickie

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printf'ing / NSLogging strings without a terminating zero byte (General->Random)

  printf ("hello %.*s\n", 5, "there is no good going on");
  NSLog (@"hello %.*s\n", 5, "there is no good going on");

results in

hello there
2007-05-04 09:14:15.575 printf[4914] hello there

Similarly, something like printf ("hello %*.*s\n", 10, 5, "florgsnorgle"); will right-justify 'florg' in a field of 10 characters.

(Thanks to TVL for this goodie)