Version 4 of Mactel/universal binaries

Kevin Walzer Apple has announced its transition to the Intel platform in 2006 after more than a decade on PPC. To ease the transition for developers, it is providing support for "universal binaries"--compilation to support both the legacy PPC platform and the new Intel platform. See http://developer.apple.com/transition/index.html for more information.

How are Tcl/Tk developers on the Mac dealing with the transition to Intel?

A few notes:

Daniel Steffen has already committed new makefiles and Xcode projects that make building Tcl/Tk as a universal binary simple. See http://aspn.activestate.com/ASPN/Mail/Message/tcl-mac/2920946 for complete details.
Extensions are a trickier matter. While many extensions such as Img are already included by default on MacOS X, and should presumably run without problem on Mactel, other extensions are not. Tile, Tclkit, Starkit, etc. are not yet available as universal binaries. My efforts to get Tile to build so far have not been successful (bug report filed at SF).
I discuss a few other points about the transition at http://www.wordtech-software.com/blog/pivot/entry.php?id=10 .

Others are invited to post their experiences/perspectives/solutions on the Mactel transition.