Quoting a bit more from the Nauseated page:

> Nauseated creatures are **unable to attack, cast spells, concentrate on
> spells, or do anything else requiring attention**. The only action such
> a character can take is a single move action per turn

It seens to me that "anything" includes special abilities, such as as *Shift*. The RAW is pretty clear - if it is a move action **that is not a spell, a attack,  or anything that requires attention**, you can do it while nauseated. You also can do only one of such actions per turn. Otherwise, you can't take that action.

So, no, you can't *shift* away. Your wizard probably will become food for some nasty DM critter pretty soon. 


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**But... How about free actions? Can I drop something I'm holding, or maybe speak something?**

Pure-RAW, no, you can't. The rules are pretty clear that you can only do a single move action per turn. However, I would rule that, if the Free Action don't need attentiveness, then you can do it without problems. You wouldn't be able to load a bow, for example, but it would be okay to drop a bow or other stuff you would be carrying.