Frédéric de Villamil committed my rails 2.3.3 patches to HEAD1 last night. Frédéric had an interesting post2 on there plans to re-factoring typo. The 2.3.3 patches have reduced the memory usage quite a lot. Once I have rebased this blogs varnish patches to the new HEAD I am going to look at getting typo running on ruby 1.9.1