Working With Numbers
Charilaos Skiadas has created a spreadsheet bundle which marks up column-formatted data and supports various functions to be run on ranges. I’m not a user of spreadsheets myself, so I probably have the terminology wrong, but there is a screencast, and it looks pretty cool!
I do however regularly have the need to do some quick ad hoc column summations and basic math, so to demonstrate how I do that, I recorded a screencast to show the math bundle in action (12 minutes, 26 MB). It also shows how to deal with column data in TextMate and a few other tidbits.