This is a useful little utility for those using portable Macs. version 1.4 and 1.4.1 had installation problems but these seem to have been fixed in 1.4.2.

Growl support is very useful, as Growl itself has configurable alerts. The sensing of plugging/unplugging is very swift and this new version van even give you alerts as your battery charge drops (user configurable) so it'll let you k ow how things are going battery-wise.

It's free, does what it says on the tin and uses almost nothing in the way of CPU cycles. I've tried a few of the other utils that do what UnPlugged does but they don't seem to do it as well.

I've put in a feature request for optional audible alerts on unplugging and apparently it may be in the next major release. Responsive developer, which is good.