The Firebird Project team is happy to announce that download kits for the first V.2.1 release candidate are now available — Windows and Linux 32-bit and 64-bit platforms now, MacOSX soon. You are invited to test it furiously and report your experiences (good or bad) back to the Firebird-devel list.
As always, please be patient if the files you want haven't made it out to the mirrors at your first attempt.