For security-conscious organizations that are also on a budget, TrueCrypt might be just the ticket. This free open source tool for Linux, Max OS X and Windows works on individual files or entire partitions or volumes. For files, it creates a virtual encrypted disk within the file and mounts it as a real disk. Encryption is automatic, transparent and performed in real time. Options include volume and OS hiding, hardware-accelerated encryption for read and write performance on par with non-encrypted volumes.