Described Lisp part of the binding project and proposed mentorship for it.

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diff --git a/community/gsoc/project_ideas.mdwn b/community/gsoc/project_ideas.mdwn
index 037e894a..6186912a 100644
--- a/community/gsoc/project_ideas.mdwn
+++ b/community/gsoc/project_ideas.mdwn
@@ -58,6 +58,37 @@ bindings](http://www.sigill.org/files/pytrivfs-20060724-ro-test1.tar.bz2), that
 perhaps can be re-used.  Also some work on [Perl
 bindings](http://www.nongnu.org/hurdextras/#pith) is availabled.
 
+### Lisp
+
+Most Lisp implementations provide a Foreign Function Interface (FFI) that
+enables the Lisp code to call functions written in another language.
+Specifically, most implementations provide an FFI to the C ABI (hence giving
+access to C, Fortran and possibly C++).
+
+Common Lisp has even a portability layer for such FFI,
+[CFFI](http://common-lisp.net/project/cffi/), so that you can write bindings
+purely in Lisp and use the same binding code on any implementation supported by
+CFFI.
+
+Many Scheme implementation also provide an FFI. [Scheme48](http://www.s48.org/)
+is even the implementation used to run scsh, a Scheme shell designed to provide
+instant access to POSIX functions.
+[Guile](http://www.gnu.org/software/guile/guile.html) is the GNU project's
+Scheme implementation, meant to be embeddable and provide access to C. At least
+[Gambit](http://dynamo.iro.umontreal.ca/~gambit/),
+[Chicken](http://www.call-with-current-continuation.org/),
+[Bigloo](http://www-sop.inria.fr/mimosa/fp/Bigloo/) and
+[PLT](http://www.plt-scheme.org/) are known to provide an FFI too.
+
+With respect to the packaging and dependencies, the good news is that Debian
+comes handy: 5 Common Lisp implementations are packaged, one of which has
+already been ported to Hurd (ECL), and CFFI is also packaged. As far as Scheme
+is concerned, 14 [R5RS](http://www.schemers.org/Documents/Standards/R5RS/)
+implementations are provided and 1 [R6RS](http://www.r6rs.org/).
+
+Pierre THIERRY would mentor creation of bindings for either Common Lisp or
+Scheme with their FFI (and welcome any attempt).
+
 
 ## Virtualization Using Hurd Mechanisms