Unsanity has updated Silk with Mac OS X 10.4 Tiger support. Silk enables Quartz text rendering and smoothing, allows substituting one font with another in your applications, and can change the theme font (the font used to display menus, window titles, and other interface elements). In addition to Tiger support, version 2.1 of Silk no longer crashes iCal 2.0, added an option to disable antialiasing for fonts, Dutch localization, and several other enhancements and bug fixes. Silk is priced at US$10.