I have often heard (here and other places) about the importance of changing your needle often, however this tutorial that I stumbled upon opened my eyes to how frequently I should be changing - they said every 8 hours of sewing! Wow - I have not been changing my needles that often. I wonder if I'll notice a big difference if I start changing more frequently.
I also thought the part about using a different size of needle for piecing, quilting, and binding was interesting.
For what its worth, I'll attach the link below.
Here is a link that might be useful: Pat Bravo needles 101