'Ghost'-style system backup

Can anyone suggest some software which will create the Mac equivlent of a ghost image for Win. I've loaded some conflicting software and my Mac has crashed twice and I need to take some 'snapshots' of the system at different points of the instal. Thanks

There is another thread around here about Retrospect. I think that may be what you are looking for.

I don't think Retrospect makes image backups of your whole system, the app I use for this is: Carbon Copy Clone (http://www.bombich.com/software/ccc.html)

Also, here is a good forum post on exactly how to go about doing this:
http://www.macosxhints.com/article.php?story=20031001224049884

SuperDuper will completely clone your hard drive and make a bootable copy to an external drive. You can find it on VersionTracker.