I am an independent consultant specializing in Free/Open Source Software. These days, I work primarily with Moodle, Mahara, SchoolTool, and Asterisk. I have several years of experience with Linux and UNIXes as a software engineer; check out my resume to see my work history. Email me if you are interested in my work.
itunes-encode (right-click and Save As) is a handy little script to help you -- entirely legally -- transform those nice iTunes into even nicer Ogg and FLAC files. Just burn a CD from within iTunes, export a song list (as ascii text), rip the CD with cdparanoia -B, and cat the song list into itunes-encode. (I no longer use this. I just by DRM-free MP3s from amazon.com.)
SimpleSearch is a small PHP script that makes it easy to put a simple search of a single data file on your webpage. If you have a spreadsheet of data that you'd like to let people search, this is perfect for you.
Vim: I wrote a beginner's reference manual and a tutorial for the vim (vi) editor. Sure, it's been done before, but I think my reference and tutorial have a unique combination of comprehensiveness and accessibility to the total beginner.