My portable toolbox includes a USB to SATA/IDE adapter, so I can easily pop the HD out of one laptop or PC and mount it on another, and it's useful for getting oneself out of these type of jams. If the files you need are stored in an encrypted file system, then that presents a snag, but even then I have a sfotware tool to crack EFS certificates.

Also, when you're doing a presentation, it a good idea to email the ppt slide to yourself and cc the meeting organizer, so there is always an easily accessible copy.