Transferring entire OS to another drive

[Eric]

What is the latest, best way to "mirror" a Linux installation to another 
drive (as a backup, or to move the installation to a larger drive)?

I do it fairly regularly (every 4 to 6 months or so) on my Windows XP 
laptop, using PowerQuest Drive Image, and usually upgrade to whatever the 
new maximum available size is for laptop drives (currently up to 120 GB, 
started at 60), and it always works well.

Anyone know of the newest versions of things like Drive Image will work 
with Linux partitions?

I more or less know about the older ways to do it, using dd and (something, 
don't remember what) to recreate the boot sector on the new drive, but I 
have never been able to get that to work very well and anyway, it seems not 
to work for moving a Linux installation to a larger drive, only seems to 
work when source and destination drives are the same size and geometry.

I guess I don't mind connecting origin and destination drives to a Windows 
box and use some Windows tool like Drive Image, if that is what I really 
and truly have to do.