Sliced Bread

Earlier today, a friend told me that her new IPod FM transmitter was "the greatest thing since sliced bread."

Which obviously leads to the question, What's so great about sliced bread???

Yes, yes... I enjoy sandwiches as much as the next person, (and judging my waistline, more than some), but let's face it, if we didn't have sliced bread, we'd be eating our ham and turkey on crackers and we'd be enjoying the hell out of it. We wouldn't know what we might be missing, but there's a reason why nice dinner parties serve cheese and crackers. They go quite well together!

So I put it out to the blogosphere... What do you consider the greatest thing since sliced bread? Or is sliced bread not so great? Should we return to the "greatest thing since the invention of the wheel?" Is some other innovation worthy of its own cliche?