If not, you can always copy if off your collegue's hard drive.
"It" being the installer package, of course. It installs stuff all over the place - apps, documentation, headers, libraries, etc., etc. Trying to copy all that stuff manually would be a massive pain.
I'm pretty sure that's what Chris meant, but I figured it was worth spelling it out for the sake of the archives. (As if anyone reads them...)
I guess if we are going for completeness in the archives, someone should mention that, if you re-partition your hard disk and re-install from the DVDs, the dev tools/xcode installer will end up in the same place again. (Unless you do a custom install and deliberately deselect it, that is.) It's on the install DVDs (or CDs) for new machines, it's just not there as a separate package.
