<Mounting the soapbox>
In my experience (such as it is), when differentiated work for GT students works, it's usually as simple as a bottle of white-out and a "x" sign.
It's all but free, quick, easy, it doesn't even require great creativity, but it makes a HUGE difference to a kid.
Differentiation is still not my first choice for GT policy. It's too easy to undermine the following year because there's nothing in writing anywhere, so the child can effectively be held back a grade (or 3!), but it IS something that any teacher can do if s/he recognizes the need and commits to teaching ALL children, even the smart ones! :p
Every time someone talks about how expensive GT ed is or how GT kids must somehow compete with special ed kids for $$$, a bottle of white-out and an "x" is what I think of. This is why I say over and over that educating GT kids does not have to be expensive.
<stepping off soapbox>
