I am using 2007, but in most tables the first column is the ID field. When you look at the ID field it is in a different color and is always visible as you scroll the table left and right.
If you wanted to freeze the task name, for example, you could move the Name field to the first column and lock it. Once you do that, you lose the outline like view, you can’t differentiate between a summary task and a base task; but the first colum is locked and will always be visible.
I am so used to seeing the ID field locked as the first column that the table looks pretty wierd with something else in there.
It is not like Excel where you can lock multiple columns. You’re only option is the first column.
2010 is supposed to be more Excel like, so maybe there is such a feature; but I’ve never heard it discussed.