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Get every header and source file (currently: SRRecorderControl.h, SRRecorderControl.m, SRRecorderCell.h, SRRecorderCell.m, CTGradient.h, CTGradient.m, SRKeyCodeTransformer.h, SRKeyCodeTransformer.m, SRValidator.h, SRValidator.m, SRCommon.h and SRCommon.m) into your project (be sure to copy the files and include them into the Xcode project).
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Also get the desirable localizations of ShortcutRecorder.strings into your resources. Do not copy the image files into your resources - they have been made obsolete by recent changes to introduce Resolution Independence.
There are two routes to go. There are Interface Builder palettes (for 2.x) and plugins (for 3.x on Mac OS X 10.5) for Shortcut Recorder, which you can use. You can also drag in a custom view (with a height of 22), drag the Shortcut Recorder header files onto the NIB's document window and change the class of the view to SRRecorderControl.
Supply a delegate and start listening to the - (BOOL)shortcutRecorder:(SRRecorderControl *)aRecorder isKeyCode:(signed short)keyCode andFlagsTaken:(unsigned int)flags reason:(NSString **)aReason and
- (void)shortcutRecorder:(SRRecorderControl *)aRecorder keyComboDidChange:(KeyCombo)newKeyCombo methods. They give you an opportunity to reject inappropriate key combinations and later be notified when a new combination has been picked. SInce you'll so often want to implement key combination filtering or set a hot key or save away the key combination when the key combination changes anyway, Shortcut Recorder forgoes the target-action pattern and only sends updates via the delegate.
Beyond that, there are a number of accessor methods, many of which are self-explanatory. Experiment!