This is basically an implementation of hak_textile_tags to be used with upm_quicktags. It is designed to be used in the write tab of Textpattern and will allow you to use textile to format your articles instead of XHTML.
This package contains a replacement write.js. Simply replace your original /upm_quicktags/write.js with this file and you will get the textile functionality. Back up your original.
Only tags that have textile equivalents were translated. The rest still output xhtml. Images and Links are currently hardcoded so they don’t output textile yet.