> Once I got to higher levels, I found that it didn't pay to carry around invokable items at all. I found they were typically either weaker than similar spells or less economically worthwhile to carry than all the +n Items of Specialness that I was picking up along the way.
>
> But yeah, invoke that Information Superhighway. It's most interesting. Don't worry aboot using it up, you'll find more eventually.

It's somewhat handy, actually, to carry around a few of these things, at least until you get the equivilant spell. Sometimes even after, though I don't go out of my way to get them anymore.