No, not the swahili word, but the Mac OS (now also for Windows) web browser: I'm testing the version 3 beta, and I like that I can re-open a tab in a new window, move tabs around in an existing window, and that Safari will warn me before closing a window I've typed some text in. Like just now, when I replied in the comments to my own blog and clicked on the "close window" button, rather than "publish". Safari stopped me from having me a) think I've commented and end up wondering why the computer hates me, or b) having to retype everything all over again and that first draft was so brilliant - and impossible to remember exactly because of course I typed lots this time. ("Re-open last closed window" also rocks.)
Why do I close the window rather than press "Publish"? For that, you can blame another piece of Mac software: MacSOUP, wherein one simply closes the window when done typing to save your brilliant retort and await sending because it's an offline newsreader.
PS: Spellcheck in Safari is on automatically now. Why can't "blame" be spelled "blaim"? Hmmm???