Quake 3 Universal Binary
When Id open sourced the Quake 3 source code awhile back, developers began immediately port it to operating systems and processors that weren't previously supported. Recently, Sqonk Online has released a port of the Quake 3 application to Universal Binary, meaning it'll run natively on the new Intel Macs. Note that this isn't the full game with all the resource files, but just the compiled Quake 3.app executable. In order to get Quake 3 running, you'll need to install the game first (from retail CD) and then just replace the executable app with the Universal Binary version, or let it sit alongside the old executable.
A few things: One, I have not tested this yet as I'm still awaiting my Intel iMac to arrive, but this is the method I've used to run other recompiled binaries (for instance, the Marathon port to Mac OS X) and it's worked fine. Two, please be kind to the developer's bandwidth and don't download the executable unless you're truly keen on using it. Remember, this is not the entire game, only the executable.
