Here are my responses:

Do you prefer shorter or more dangling type of markers?

Variety is the spice of life. As is whimsy :)

Is there any kind of markers that you would absolutely NOT want to recieve?

pointy, snaggy ones

Colors you like most? blues, reds, pinks, greens

Colors you like least? puce, brown

Would you prefer markers for smaller or larger sized needles?

both, but more smaller ones

Do you want your sender to reveal themselves when they're shipped or at a later date? I'd like to find out once I post that I've recieved them either by posting to my blog, or http://stitchmarkerswaps.blogspot.com