We are pleased to announce the release of CMUCL 20b. The key changes in this release are: o www.cmucl.org is a mirror of the CMUCL website at www.cons.org/cmucl. (Thanks to Carl for recovering that domain.) o the unicode build has much faster streams, especially for utf8. o support for localization, including CMUCL messages (but translations are not done, except for piglatin, for fun) o executable images for Linux, FreeBSD, Mac OS X, and Solaris o support for static arrays that are not moved by gc, but are gc'ed when not referenced o asdf2 and mk-defsys are included There have also been quite a few other changes and bug fixes; we refer the interested reader to the release notes at http://www.cmucl.org/news/release-20b.txt We hope you find this release useful.