To follow up on what Kelsey said, there's a drug-resistant strain of H1N1 going around Europe this year. Of 148 isolates, 19 samples of A(H1N1) were resistant to oseltamivir (Tamiflu), and of the 16 samples sent in from Norway, 12 of them were drug resistant. The drug-resistant strain is not more virulent or severe than non-drug resistant strains.
On a side note, there seems to be a strange flu going around the public schools and is invading Stanford dorms. Of the two cases I've seen, it's involved severe vomiting, fever of 102-104, violent coughing (coughing up yellowish sputum), and nosebleeds with blood clots.
Two people on my hall have fallen ill... and their roommates are now regretting not having gotten the flu shot. :-/