If you're looking to send large files, why not give Digital Pigeon a try? With this free version of the program, users can send up to four 500MB files a month to three recipients. It's a great way to consolidate the transfer of large pieces of information, and the site includes a demonstration and an FAQ section. This version is compatible with all operating systems.
Recoll is a cross-platform desktop search tool able to index nearly anything included inside nested files. From their website: "Recoll will index an MS-Word document stored as an attachment to an e-mail message inside a Thunderbird folder archived in a Zip file." Supported formats include HTML, OpenOffice, Microsoft Office, Office XML, PDF, WordPerfect, PostScript, TeX, and many others. Searches...