Signature Needle Arts needles
Kollage Square needles
These metal needles come in all the standard formats, and some people find them to be more comfortable (some found them less!)
Knitter's Pride Dreamz
Dreamz are color coded laminated wood needles with fairly sharp points and flexible cords. (They also come in a square version) The example of these were an interchangeable set. These are nice because you have every possible needle size and cord length together in 1 set. They are especially nice for garments that will grow (like a circular shawl) or that you might want to try on as you go.
There were also several interchangeable sets of Darn Pretty wood needles from Dyak Craft. These are hand made in Vermont. Unfortunately there was a fire at the DymondWood supplier last fall and they are currently not taking orders for the wood needles. They are still producing the metal interchangeable needles pictured above.
A variety of Chaiogoo needles were represented. These come in bamboo, metal (stainless steel), and lace (sharp) points, in DPN, circular fixed, and interchangeable styles. Their signature red cables are multi-strand, steel cable coated with red nylon that allows yarn to slide and has no memory. You may find that a good thing, or not, it seems to be a personal preference.
A variety of HiyaHiya needles were represented. These are a relatively affordable needle, and come in all varieties of fixed/interchangeable/DPN and metal (sharps and regular) and bamboo.
Another set of interchangeables mentioned. Some features of these are that they click lock instead of screwing, are plastic (you may like, or not) and are fairly blunt points for those of you who do not like very sharp needles.
Fair Trade, hand painted wooden needles.
There were others! So many, but these are a pretty good selection, and some of what was most discussed.