In that photo, his bike computer doesn't appear to be the usual HAC4.
Any clue what hes using?

It looks like a vetta v100 wireless from the fork mount.

From Christian Vande Velde:
"Counting grams
Prior to the start Roberto had to change his rear wheel as his bike was 100 grams under the legal weight. The climbers on the team have bikes with small wheels as well. Lance had a weight problem before the start as well and the Postal mechanics had to throw a couple of computers, or something, on his bike to bring it to 6.8 kg. I was pleasantly surprised that my stock race bike came in at 6.9."
http://www.velonews.com/tour2004/diaries/articles/6636.0.html

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"Gimondi è un eroe umano, che viene sconfitto ma che continua la sua corsa fino a tornare a vincere." - Enrico Ruggeri

What does he ride, I wonder?

Wait... maybe I shouldn't have asked that. I think they're rebadged Giants (BH)!

Well, he's on Liberty right?
So...a Giant/BH??? Please, let's not reopen that rebadge thing again!

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"Gimondi è un eroe umano, che viene sconfitto ma che continua la sua corsa fino a tornare a vincere." - Enrico Ruggeri

the UCI demands the bikes to be fitted with 2 working brakes

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Auribus teneo lupum

When riding with constant speed weight distribution doesn't matter.

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Whow! That's a pretty damn nice garage door!

Do you have cruise control on your bike?
Have you ever checked the speed readouts on a Polar graph?
Even on the flattest of surfaces your speed is varying all the time, thus although you are correct in theory , in practice the influence of the rotating mass (wheels) is indeed playing all the time .
Another theory vs practice thingie.

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Auribus teneo lupum

So did Lance ride the Madonne SSL or the SL on the time trial?

Once again Frankie showed his bike beofe the climb and said that he was using the SL but the SSL was made especially for this climb-

Does anybody know for sure??????

I believe Lance rode the SL, SL is right on the limit already and there were some questions regarding to the rigidity of SSL. But of course, it's too difficult to tell from pictures since both bikes pretty much looked the same.

On Sporza they interviewed the mechanic where Lance gets his tubes and he said Lance used a frame especially made for this occasion with less fibers per square meter in the carbon .
He also said that Trek was thinking of commercialising this frame a rato of 6000€
There would also be a warning attached to it regarding the max weight of the rider.
About those tubes. They stay in a darkened room for 6-7 years to make them softer and less resistant thus better rolling. He only has 6 left . I'm not sure about the make of the tubes but it wasn't Vittoria , perhaps Clement.

Ulrich used a special frontwheel only to be used for uphill.

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Auribus teneo lupum

Jeez, it's like a fine wine or cheese.

Wasn't Lance riding Dugast tubulars?

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Whow! That's a pretty damn nice garage door!

aging tubulars is old-school man, all the big guns used to do that. I could see doing that to a set of Dugasts, heck yeah!

I've thought about aging clinchers, as I found some tires picked up flats earlier when they were new, then got tougher as they aged...or at least it appeared that way to me.