You mean haven't bent yet, don't you? :p
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I have had the Kelty nobendium stakes bend. I sent them back and got new ones only to have them bend again.
The groundhog stakes (red ones) that was mentioned above is probably one of the better stakes for not bending.
From looking at the picture of the Groundhog stakes, they look just like mine except mine are blue and they don't have that piece of line on them, but other than that they look the same.
EDIT:
I did a little searching and it seems I am using the Sierra Designs Y-peg.
I got 6 free one yr as a Christmas ornament. If you wrap a silver pipe cleaner around them you can use it to decorate your Christmas Tree like an icicle.
The Scout Shop sells something like the groundhogs, in aluminum for $1 CAD each.
I got an REI gift card recently and bought the titanium nails mentioned in the first message. Prolly wouldn't have bought them with my own, hard earned cash. I've used them once (pretty rocky soil) with no evidence of damage.
The titanium nail pegs are very good - durable. You really only need one or 2 and then another Ti or Al stake. If the ground is really hard or rocky, just pound the Ti nail into the ground and immediately extract. Then push the smaller Ti or Al peg in the hole. Saves abusing the smaller stakes.
Looks like the golite Y stakes I use. Same concept on all of them. A Y shape for strength. I only had issues when I hammered them into the ground last winter for my sub-zero hang. I broke one of them when I tried to pull it out (with pliers). After that I left them in until the snow melted. No signs of rust after a few weeks in the ground though.