Here's what I want to know: why did Physiology/Medicine go to the people who figured out how telomeres work, and Chemistry to the people who figured out how the ribosome works, and not the other way around?
Telomeres are the little chemical caps on the end of chromosomes which protect chromosomes from degradation during cell division, and telomerase is the enzyme which builds them and keeps them stable from cellular generation to generation. Ribosomes are the organelles in your cells which are the little factory workers of molecular biology's Central Dogma: when we say "DNA makes RNA makes protein", it's the ribosomes which physically
do the "RNA makes protein" piece of the puzzle, translating messenger RNA into amino acids codon by codon and then assembling the amino acids into proteins.
Given the ribosome's role in protein construction, if they'd asked me to decide (hah!), I would have given Physiology/Medicine to the ribosome scientists, and given that the telomere/telomerase interaction is a narrower chemical process, I would have given Chemistry to the telomere scientists.
I have this mental image of the Nobel committee arguing long into the night about which award to give to whom, and finally saying "Okay, heads Chemistry goes to the ribosome, tails to the telomere," then flipping the Chemistry medal. Both discoveries explain fundamental chemical building blocks of the biology of every living organism on this planet, from the lowliest
Archaeobacteria to you and me. It's difficult to say "well, this one is
obviously chemistry and this one is
obviously biology," and I'm curious what the reasoning is. The
press releases do shed some light on the subject, however; the Medicine one focuses on telomeres' role in aging, and the incredibly important discovery that cancer cells' telomeres don't degrade the way that normal cells' telomeres do (making cancerous cells effectively immortal), and the Chemistry one makes special mention of how Ramakrishnan, Steitz and Yonath used X-ray crystallography to map out every atom of the ribosome. So that makes a bit more sense.
Regardless, however, both groups' work is incredibly important, has advanced our understanding of How Life Works enormously, and is eminently worthy of the Nobel Prize. Heartfelt congratulations to Elizabeth H. Blackburn, Carol W. Greider and Jack W. Szostak, winners of the 2009 Nobel Prize in Medicine, and to Venkatraman Ramakrishnan, Thomas A. Steitz, and Ada E. Yonath, winners of the 2009 Nobel Prize in Chemistry, on their excellent work. May your discoveries continue, and may you continue to inspire future generations of scientists to further our understanding of the processes of life.