iSilo(TM) displays formatted hyperlinked documents. Compression is 20% better than the Palm Doc format. Text formatting includes mixed size text, colored text, underlininig, italics, bold, subscript and superscript, fixed-width font, and more. Images can be compressed greyscale (1-bit/2-bit/4-bit) and color (8-bit/16-bit), large and scrollable, and intermixed with text. Tables can have many rows and columns, can be nested within one another, support mixed borders, and more. Display and scrolling options are highly configurable. Additional features include bookmarks, beaming, copy and paste, search, among others. Documents can be accessed through VFS on SD/MMC, compact flash, and Memory Stick(R). iSilo(TM) also has native support for the special features of the HandEra(TM) 330 and the 320x320 hi-res display of Sony CLIE devices. With iSiloX, you can create your own iSilo(TM) documents from content on your local hard drive or from content on the Web.
Updated Description:

Version 4.0 adds the following features:
- UX-50/UX-40 widescreen support.
- Garmin iQue 3600 expanded screen support.
- Tungsten T3 support expanded screen support (requires Palm DIA compatibility PRCs).
- Font Silo for custom fonts supporting Font Silo, FontBucket, and FontHack fonts.
- Support for new iSilo 4.x document format features such as content encoding information, inline menus, and vCard/vCalendar objects.