Head position on the bike
Okay, so I've been paying attention more to my head position after some of Mancona's observations and he's totally right- my big ole head is killing my aero mojo! 
So my question is this (or several questions actually)- how do you guys see anything? or is that the sacrifice- 10 feet of view versus looking up the road?? between my helmet + glasses feels look I'm looking straight down when I tuck down in the right position.
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I don't
Serriouly, I have very limited sight when I'm in the position that seems the most aero, what helps is either wearing frameless sunglasses or using my LG aero helmet with the visor and no glasses.
I only ride this way on the training, on open roads with no traffic or race day because I don't feel safe on normally daily rides only being able to see 10-15 feet in front of me.
Not looking where you are going to hopefully gain a few seconds aero wise seems like a really bad idea. You hear over and over from people who have spent time in wind tunnels that what you think is more aero may not be anyway. If you crash into a parked car like I watched someone do in a race a couple of years ago cause they were looking down you will be slow regardless.
It seems to me that an aero helmet may be better if you're looking forward--that way the tail isn't sticking straight up!
I don't know of one that is available... which is why I swithced to an LG helmet. Plus the LG fits me better anyway as I was right inbetween Giro sizes.
I have seen people buy the LG visor and cut it to fit the Giro and then tape it on. I wasn't going to try that though since I didn't like the giro helmet in the first place.
Irronically enough, giro road helmets fit me great and I love them.
What Matt A says. I "turtle" my head or anterior translate it with my aerohelmet rotated to show more forehead and look at the front wheel or PM for 10-20 pedal strokes then I shift my eyes up with maybe a slight extension to glance at the road conditions then I'm back down. I look for shimmer of glass, cars coming out of side streets, trashcans, dead animals. It only takes a glance on familar roads. Keep in mind that I would never recommend that my own children do this as it is dangerous as sometimes I fall asleep and look too long at the PM.
With the helmet rotated to show a little more forehead the tail sits nice and low rather than up in the air allowing for a more streamlined flow down your back.
Vince
I recall a podcast from David Warden a year or so ago about wind test and head position...my recollection was that it could really vary from one rider to another, much different than they thought. One rider who did the "turtle" was actually quite a bit less aero than riding in the normal position. I will see if I can locate that over the weekend.
I am also concerned about sliding the helmet back as it would then provide less protection for the event that "shall not be spoken"
since it is currently the topic in other discussions...