This new version (download) features a lot of improved detection mechanisms (which in parts were already made available through the regular 1.4 updates in the past months), improved Operating System support (Windows Vista integration, restored support for Windows 95, more compatibility with Wine, support for bootable Windows CDs), improved browser support (e.g. for immunization) and much more - you can find an overview of noticable changes and some screenshots here.

Spybot - Search & Destroy can detect and remove spyware of different kinds from your computer. Spyware is a relatively new kind of threat that common anti-virus applications do not yet cover. If you see new toolbars in your Internet Explorer that you didn't intentionally install, if your browser crashes, or if you browser start page has changed without your knowing, you most probably have spyware. But even if you don't see anything, you may be infected, because more and more spyware is emerging that is silently tracking your surfing behaviour to create a marketing profile of you that will be sold to advertisement companies. Spybot-S&D is free, so there's no harm in trying to see if something snooped into your computer, too.