> What are most developers running? The very latest, most unstable builds. > What is probably the most thoroughly tested? 2.0.25 on Berkley DB 3. I love (Debian) Linux, and for stability it beats the pants off Windows and Mac OS. But it is fundamentally by and for hackers, not stability freaks. A money-is-no-object stability-o-phile would run Solaris (and his poor cousin would run BSD).