I've noticed everyone around me getting sick lately (I seem to have become mostly immune to colds and the flu in the last couple of years), so I took a look at 
Google Flu Trends.  Lo and behold, the United States is currently near peak flu incidence for the 2010-2011 season.  Here's a graph from Flu Trends.  This year's trend is in dark blue:

Flu Trends also has data for individual US states and a number of other countries.
It's time to tighten up your diet and lifestyle if you want to avoid the flu this year.  Personally, I feel that eating well, managing stress effectively, and taking 2,000 IU of vitamin D3 per day in winter have helped me avoid colds and the flu.