I have taken nail clippers on board lately with no problem. Last time we flew, had more problems with my metal knee - I was checked over for about 5 minutes - offered to show them the scar, but they weren't interested. LOL We left enough time because we knew they would stop us. I usually read on planes, so never have tried to take needles. The October we flew after 911, they were a lot more strict then they are now. But you have to thank them for being so strict - it might save your life.
Two years ago my daughter was flying back to Maryland with Maine blueberry jelly and they took it - she called me on my cell and I had to go back in the airport and get it - luckly we have small airports here in Maine. The TSA agent said they would just throw the jelly away, even though she offered to give it to the agent.