After 6 months of development, Puppy Linux 4 has been released. The last 6 months has seen lots of development and this version is a significant upgrade to its predecessor. Puppy Linux 4 is now a complete GTK2 system and all GTK1 and Tcl/Tk code has been abandoned.

Now with the support for GTK2 there are lots of new applications:

ePDFView (PDF viewer), Pschedule (cron GUI), Osmo (personal organiser), Pcdripper (audio CD ripper), RipOff (audio CD ripper), mhWaveEdit (audio editor), Pburn (CD/DVD burner), MTR (traceroute), Pnethood (Samba client), Pwireless (wireless scanner), pStopWatch (stopwatch), HomeBank (personal finances), ExpenseTracker (personal finances), ChmSee (CHM help viewer), Gmeasures (units converter), Fotox (image viewer), Gwhere (disk catalogger), Prename (batch file renamer), gFnRename (batch file renamer), Pfind (file search), Pprocess (process manager), Chtheme (GTK theme chooser), HardInfo (hardware information), PcurlFtp (simple network file sharing), Pidgin (multiprotocol chat client), Gadm-Rsync (GUI for rsync), Wireless Autoconnect, Gtkam (digital camera interface), Xsane (scanner interface), Figaro’s Password Manager 2, HotPup (drive icons on desktop) .

You can read more here: http://puppylinux.com/download/release-4.00.htm