Damn Small is small enough and smart enough to do the following things:
Boot from a business card CD as a live linux distribution (LiveCD)
Boot from a USB pen drive
Boot from within a host operating system (that's right, it can run *inside* Windows)
Run very nicely from an IDE Compact Flash drive via a method we call "frugal install"
Transform into a Debian OS with a traditional hard drive install
Run light enough to power a 486DX with 16MB of Ram
Run fully in RAM with as little as 128MB (you will be amazed at how fast your computer can be!)
Modularly grow -- DSL is highly extendable without the need to customize

Change log for v4.4RC1:

* New Lua/Fltk refactored for enhanced performance.
* New Fltk library now available for C/C++ programs.
* Update to rsync to v3.0.2
* Restored Firefox default search engines.
* New low resource background theme.
* New default system font, smoothansi.
* New .luafltkrc for Lua/Fltk theme and defaults.
* Updated dmix.
* Updated man script, new -o -b options and site.
* Fixed permissions on fusermount.
* Updated all Lua Lua/FLtk scripts to the new Lua/Fltk system.

Files that have changed that are likely in your backup.
.Xdefaults
.jwm.inc
.jwmrc-theme
.dfminfo
.fluxbox.inc