Trustware's BufferZone was an early entrant into the desktop sandboxing arena. Sandboxing, of course, is the security-by-isolation system which has since been built into apps like Google Chrome and Adobe Reader X. Recently, Trustware launched a promotion and gave away BufferZone Pro for free -- and now the company is making the discount permanent. From now on, BufferZone Pro will be freeware.

But, wait -- BufferZone still doesn't support x64, and maybe you're thinking that there will be a paid version once a 64-bit Windows version arrives. Not so, Trustware's Efrat Schneider told me in an email: "The product will continue to be free," he replied.

If you're looking for a free way to tighten up security on your Windows system, BufferZone is an excellent app for the job. We'll let you know when the 64-bit version becomes available.