Hermione Wrote:
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[...]
> (Yes, but the car - whether or not its engine is
> working - has wheels ... )

And the majority of cars have axles which require grease or heavy oil which would be the equivelant of lard in ancient times. And even if the engine is not working one can get a cow or a few friends to pull it with a rope.
Before cars and wheels, the evidence for rope to aid in the moving of bluestones overland is a little circumstantial, but most people would agree that the hard evidence for a bow (Somerset @ 2690 BC) would require a bowstring.
[www.archerygb.org]
A rope is nothing more than a bunch of bowstrings twisted together. There are any number of natural plant fibers, while not as good as today's nylon, that can be used to make a rope (and coated with pitch or lard can be made waterproof) strong enough using multiple ropes to either lift or drag a bluestone.

> The Altar Stone (Stone 80) weighs about 6 tons.
>
> The heaviest of the granite blocks at the Great
> Pyramid weigh somewhere between 50-80 tons. The
> granite for the pyramid was obtained from Aswan,
> about 550 miles to the south, and was transported
> to Giza by boat. The limestone casing-stones from
> the Tura quarries apparently weigh somewhere
> between 15-20 tons, and, again, were transported
> to Giza by boat,

One nice thing about the Egyptian theories for moving rock is they have some actual paintings of boats, sledges, rope, and water (cheap lard!) to help out:
[mercadonews.com]

> and then presumably on to the
> construction site by wooden sledges.

I posted a reference to these people on this list 5 or 6 years ago, but here is a better discussion:
[www.andywhiteanthropology.com]

> (One might
> at first think that a wooden sledge would simply
> have collapsed under the weight: but there are
> various references in the archaeological record to
> such sledges.)

Well, the term 'sledge' as used in the literature to describe moving heavy objects in ancient times is rather deceiving. It is nearly impossible to collapse one and the same material, wood, used in ancient times is still used today to move objects that weigh 5000 tons.
[www.hallofmaat.com]