Peter Norvig wrote the Lisp to Dylan translator (ltd) while at Harlequin. It handles a lot of the boring "grunt work" required to convert a Common Lisp program to Dylan, such as changing to infix syntax and substituting function names for commonly-used functions.
The documentation and the original source can be found here.
Peter S. Housel has updated ltd with an ASDF definition, fixed it to run on SBCL, and updated the Dylan utility runtime library for modern Dylan compilers (Gwydion Dylan and Open Dylan). This version is not yet released, but it may be checked out from the Subversion repository at svn://anonsvn.gwydiondylan.org/scm/svn/dylan/trunk/ltd/.
Dylan s-exp syntax