I've built the following Guile and Guile-related packages for the 770.

guile_1.6.8-5_arm.deb
slib_3a1-4.4_all.deb
g-wrap_1.9.3-2_arm.deb
guile-gnome-platform_2.7.98-3_arm.deb

They can all be downloaded and installed from http://www.ossau.uklinux.net/.

There are some rough edges here. In particular, some of the libraries are not stripped (because of scratchbox build problems), and I haven't yet managed to wrap the hildon-specific widgets for Guile. But it's already possible to write simple GUI apps using generic GTK widgets.

Regards, and please let me know if you have any questions or hit problems. - Neil