Automatic adjust brightness through out the day
An application like Locale ($9.99USD) will let you do that. At say 9 am you can adjust the brightness to one setting, then add another condition to adjust the brightness to a different setting at a different time.

Tasker should be able to do it as well. It does a lot of what Locale does, plus more. It also supports all the Locale plug-ins. It is also about $5.99USD.