along with my 650 front wheel, when i'm riding in circles in a parking space, i find it practical to run tiny risers so i don't hit my frame with the bars. oh and my rear aerospoke is quite practical when it comes to not having to true my wheels. of course with the 650 wheel on a 700 fork, it's not possible to run a front brake, and it's just not practical to run a rear one, so i just don't.
all in all, i think i have a very practical bike.