As, I assume, CFM apps still work with on Intel, you could use a CFM app front end (used by people to get around the version check issues in the Apple frameworks) that launches your gcc 3.0 app (for 10.2 - 10.3.8), or your "modern" gcc 4.0 universal binary for 10.3.9+ customers. The CFM app is VERY small, just checks the system version, puts up any "can't run on this version" dialogs, and calls launch services to launch the appropriate app. It's probably more work that what Chris described, but is another option.
We might need to continue support 10.3 customers who've not upgraded to 10.3.9 so we need to use gcc 3.3
For 10.3 we recommend that you just build with gcc 4.0 and advise your users to update to 10.3.9. It's free, it's more stable, it's more secure.
If your customers are still on 10.2.8, though, it's a different story. You can build your ppc side with gcc 3.3 and your Intel side with gcc 4.0. It's a little tricky, but it is possible. At this point you have to build them as separate targets and lipo them together in a shell script build phase. If demand is high we may improve this in the future.
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